TY  - JOUR
AU  - Damjanovic, L. J.
AU  - Mioč, Ubavka B.
AU  - Bajuk-Bogdanović, Danica V.
AU  - Cerovic, N.
AU  - Marić-Stojanović, M.
AU  - Andrić, Velibor
AU  - Holclajtner-Antunović, Ivanka D.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1177
AB  - Medieval pottery from excavations at Novo Brdo, Serbia, an important mining and trading centre during the 14th and 15th centuries, was investigated by a combination of optical microscopy, inductively coupled plasma - optical emission spectrometry, Fourier transform infrared, micro-Raman and energy-dispersive X-ray fluorescence spectroscopy and X-ray powder diffraction methods in order to determine its composition and firing temperature. The samples investigated were made of medium- to coarse-grained, non-calcareous clay, by a relatively well-controlled firing procedure in an oxidizing atmosphere. The firing temperature was estimated to be 850-950 degrees C. The similarity between the chemical composition of the investigated pottery and the local raw clay, combined with the outward appearance and the archaeological findings, indicate domestic production. The pottery is covered with the transparent lead-rich glaze. Iron and copper were used as colourants.
T2  - Archaeometry
T1  - Archaeometric Investigation of Medieval Pottery from Excavations At Novo Brdo, Serbia
VL  - 58
IS  - 3
SP  - 380
EP  - 400
DO  - 10.1111/arcm.12185
ER  - 

@article{
author = "Damjanovic, L. J. and Mioč, Ubavka B. and Bajuk-Bogdanović, Danica V. and Cerovic, N. and Marić-Stojanović, M. and Andrić, Velibor and Holclajtner-Antunović, Ivanka D.",
year = "2016",
abstract = "Medieval pottery from excavations at Novo Brdo, Serbia, an important mining and trading centre during the 14th and 15th centuries, was investigated by a combination of optical microscopy, inductively coupled plasma - optical emission spectrometry, Fourier transform infrared, micro-Raman and energy-dispersive X-ray fluorescence spectroscopy and X-ray powder diffraction methods in order to determine its composition and firing temperature. The samples investigated were made of medium- to coarse-grained, non-calcareous clay, by a relatively well-controlled firing procedure in an oxidizing atmosphere. The firing temperature was estimated to be 850-950 degrees C. The similarity between the chemical composition of the investigated pottery and the local raw clay, combined with the outward appearance and the archaeological findings, indicate domestic production. The pottery is covered with the transparent lead-rich glaze. Iron and copper were used as colourants.",
journal = "Archaeometry",
title = "Archaeometric Investigation of Medieval Pottery from Excavations At Novo Brdo, Serbia",
volume = "58",
number = "3",
pages = "380-400",
doi = "10.1111/arcm.12185"
}

Damjanovic, L. J., Mioč, U. B., Bajuk-Bogdanović, D. V., Cerovic, N., Marić-Stojanović, M., Andrić, V.,& Holclajtner-Antunović, I. D.. (2016). Archaeometric Investigation of Medieval Pottery from Excavations At Novo Brdo, Serbia. in Archaeometry, 58(3), 380-400.
https://doi.org/10.1111/arcm.12185

Damjanovic LJ, Mioč UB, Bajuk-Bogdanović DV, Cerovic N, Marić-Stojanović M, Andrić V, Holclajtner-Antunović ID. Archaeometric Investigation of Medieval Pottery from Excavations At Novo Brdo, Serbia. in Archaeometry. 2016;58(3):380-400.
doi:10.1111/arcm.12185 .

Damjanovic, L. J., Mioč, Ubavka B., Bajuk-Bogdanović, Danica V., Cerovic, N., Marić-Stojanović, M., Andrić, Velibor, Holclajtner-Antunović, Ivanka D., "Archaeometric Investigation of Medieval Pottery from Excavations At Novo Brdo, Serbia" in Archaeometry, 58, no. 3 (2016):380-400,
https://doi.org/10.1111/arcm.12185 . .

TY  - JOUR
AU  - Perišić, Nebojša
AU  - Marić-Stojanović, Milica
AU  - Andrić, Velibor
AU  - Mioč, Ubavka B.
AU  - Damjanović, Ljiljana S.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1406
AB  - A study of decorated Neolithic pottery samples from the excavation site Plocnik, Serbia, was performed using X-ray powder diffraction (XRPD), Fourier transform infrared (FTIR) and X-ray fluorescence (XRF) spectroscopy. The investigated samples belong to the era of the Vinca culture that existed in the central Balkan region from the mid VI until the first half of the V millennium BCE. The mineralogical composition of the pottery samples and comparison of the investigated pottery with thermally treated local clay indicated firing temperatures in the range from 600 to 800 degrees C. Two different types of white pigments were identified in white incrusted decorations: calcium carbonate and bone white (composed of crushed bones). This is the first evidence of the use of bones for decorations in pottery of the Vinca culture from the excavation site Plocnik. In addition to this, it was revealed that the potters used the iron reduction technique for obtaining black decorations.
T2  - Journal of the Serbian Chemical Society
T1  - Physicochemical characterisation of pottery from the Vinca culture, Serbia, regarding the firing temperature and decoration techniques
VL  - 81
IS  - 12
SP  - 1415
EP  - 1426
DO  - 10.2298/JSC160823100P
ER  - 

@article{
author = "Perišić, Nebojša and Marić-Stojanović, Milica and Andrić, Velibor and Mioč, Ubavka B. and Damjanović, Ljiljana S.",
year = "2016",
abstract = "A study of decorated Neolithic pottery samples from the excavation site Plocnik, Serbia, was performed using X-ray powder diffraction (XRPD), Fourier transform infrared (FTIR) and X-ray fluorescence (XRF) spectroscopy. The investigated samples belong to the era of the Vinca culture that existed in the central Balkan region from the mid VI until the first half of the V millennium BCE. The mineralogical composition of the pottery samples and comparison of the investigated pottery with thermally treated local clay indicated firing temperatures in the range from 600 to 800 degrees C. Two different types of white pigments were identified in white incrusted decorations: calcium carbonate and bone white (composed of crushed bones). This is the first evidence of the use of bones for decorations in pottery of the Vinca culture from the excavation site Plocnik. In addition to this, it was revealed that the potters used the iron reduction technique for obtaining black decorations.",
journal = "Journal of the Serbian Chemical Society",
title = "Physicochemical characterisation of pottery from the Vinca culture, Serbia, regarding the firing temperature and decoration techniques",
volume = "81",
number = "12",
pages = "1415-1426",
doi = "10.2298/JSC160823100P"
}

Perišić, N., Marić-Stojanović, M., Andrić, V., Mioč, U. B.,& Damjanović, L. S.. (2016). Physicochemical characterisation of pottery from the Vinca culture, Serbia, regarding the firing temperature and decoration techniques. in Journal of the Serbian Chemical Society, 81(12), 1415-1426.
https://doi.org/10.2298/JSC160823100P

Perišić N, Marić-Stojanović M, Andrić V, Mioč UB, Damjanović LS. Physicochemical characterisation of pottery from the Vinca culture, Serbia, regarding the firing temperature and decoration techniques. in Journal of the Serbian Chemical Society. 2016;81(12):1415-1426.
doi:10.2298/JSC160823100P .

Perišić, Nebojša, Marić-Stojanović, Milica, Andrić, Velibor, Mioč, Ubavka B., Damjanović, Ljiljana S., "Physicochemical characterisation of pottery from the Vinca culture, Serbia, regarding the firing temperature and decoration techniques" in Journal of the Serbian Chemical Society, 81, no. 12 (2016):1415-1426,
https://doi.org/10.2298/JSC160823100P . .

TY  - JOUR
AU  - Damjanović, Ljiljana S.
AU  - Marjanovic, Olgica
AU  - Marić-Stojanović, Milica
AU  - Andrić, Velibor
AU  - Mioč, Ubavka B.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/651
AB  - A multianalytical study of two Serbian icons, The Virgin and Child and St. Petka, painted on canvas by unknown authors was performed in order to identify the materials used as pigments, binders and the ground layer. The investigated icons belong to the Museum of the Serbian Orthodox Church in Belgrade. Samples, collected from different parts of the icons, were analysed by: optical microscopy (OM), energy dispersive X-Ray fluorescence (EDXRF), Fourier transform infrared (FTIR) and micro-Raman spectroscopy. The obtained results revealed the presence of the following pigments: Prussian Blue, ultramarine, Green Earth, iron oxides, Lead White and Zinc White. Linseed oil was used as the binder. The materials used for the ground layers were gypsum, calcite, baryte and Lead White. The gilded surface of the icon The Virgin and Child was made of gold. The gilded surface on the frame of this icon was made of imitation of gold, i.e., Schlagmetal, since EDXRF spectroscopy showed the presence of copper and zinc, while gold was not detected. Based on the style and the consideration of an art historian, as well as on the obtained results for the corresponding pigments and binder, both icons were most probably made at the end of 19th or the beginning of the 20th century.
T2  - Journal of the Serbian Chemical Society
T1  - Spectroscopic investigation of two Serbian icons painted on canvas
VL  - 80
IS  - 6
SP  - 805
EP  - 817
DO  - 10.2298/JSC140722099D
ER  - 

@article{
author = "Damjanović, Ljiljana S. and Marjanovic, Olgica and Marić-Stojanović, Milica and Andrić, Velibor and Mioč, Ubavka B.",
year = "2015",
abstract = "A multianalytical study of two Serbian icons, The Virgin and Child and St. Petka, painted on canvas by unknown authors was performed in order to identify the materials used as pigments, binders and the ground layer. The investigated icons belong to the Museum of the Serbian Orthodox Church in Belgrade. Samples, collected from different parts of the icons, were analysed by: optical microscopy (OM), energy dispersive X-Ray fluorescence (EDXRF), Fourier transform infrared (FTIR) and micro-Raman spectroscopy. The obtained results revealed the presence of the following pigments: Prussian Blue, ultramarine, Green Earth, iron oxides, Lead White and Zinc White. Linseed oil was used as the binder. The materials used for the ground layers were gypsum, calcite, baryte and Lead White. The gilded surface of the icon The Virgin and Child was made of gold. The gilded surface on the frame of this icon was made of imitation of gold, i.e., Schlagmetal, since EDXRF spectroscopy showed the presence of copper and zinc, while gold was not detected. Based on the style and the consideration of an art historian, as well as on the obtained results for the corresponding pigments and binder, both icons were most probably made at the end of 19th or the beginning of the 20th century.",
journal = "Journal of the Serbian Chemical Society",
title = "Spectroscopic investigation of two Serbian icons painted on canvas",
volume = "80",
number = "6",
pages = "805-817",
doi = "10.2298/JSC140722099D"
}

Damjanović, L. S., Marjanovic, O., Marić-Stojanović, M., Andrić, V.,& Mioč, U. B.. (2015). Spectroscopic investigation of two Serbian icons painted on canvas. in Journal of the Serbian Chemical Society, 80(6), 805-817.
https://doi.org/10.2298/JSC140722099D

Damjanović LS, Marjanovic O, Marić-Stojanović M, Andrić V, Mioč UB. Spectroscopic investigation of two Serbian icons painted on canvas. in Journal of the Serbian Chemical Society. 2015;80(6):805-817.
doi:10.2298/JSC140722099D .

Damjanović, Ljiljana S., Marjanovic, Olgica, Marić-Stojanović, Milica, Andrić, Velibor, Mioč, Ubavka B., "Spectroscopic investigation of two Serbian icons painted on canvas" in Journal of the Serbian Chemical Society, 80, no. 6 (2015):805-817,
https://doi.org/10.2298/JSC140722099D . .

TY  - JOUR
AU  - Holclajtner-Antunović, Ivanka D.
AU  - Mioč, Ubavka B.
AU  - Todorović, M.
AU  - Jovanović, Zoran M.
AU  - Davidović, Milorad P.
AU  - Bajuk-Bogdanović, Danica V.
AU  - Laušević, Zoran
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4139
AB  - Potassium salts of 12-tungstophosphoric acid with varying amounts of cation, KxH3 - xPW12O40(x = 1, 2, 3) have been prepared and their characteristics investigated by thermal analyses. FT-IR and micro-Raman spectroscopy and SEM-EDS analysis. It was found that the number of replaced protons by potassium ions in the 12-tungstophosphoric acid structure has influence on the presence of different protonic species, their dynamic equilibrium and on the conductivity of salts. The results reported in this study have been applied to improve the structural model of insoluble acidic salts. It is shown that an acidic potassium salt presents a mixture of neutral salt and unreacted acid. The nature of this mixture depends on the number of replaced protons-oxonium ions by cations. Preliminary measurements with synthesized compounds as solid electrolytes in fuel cells have been done, too. (C) 2010 Elsevier Ltd. All rights reserved.
T2  - Materials Research Bulletin
T1  - Characterization of potassium salts of 12-tungstophosphoric acid
VL  - 45
IS  - 11
SP  - 1679
EP  - 1684
DO  - 10.1016/j.materresbull.2010.06.064
ER  - 

@article{
author = "Holclajtner-Antunović, Ivanka D. and Mioč, Ubavka B. and Todorović, M. and Jovanović, Zoran M. and Davidović, Milorad P. and Bajuk-Bogdanović, Danica V. and Laušević, Zoran",
year = "2010",
abstract = "Potassium salts of 12-tungstophosphoric acid with varying amounts of cation, KxH3 - xPW12O40(x = 1, 2, 3) have been prepared and their characteristics investigated by thermal analyses. FT-IR and micro-Raman spectroscopy and SEM-EDS analysis. It was found that the number of replaced protons by potassium ions in the 12-tungstophosphoric acid structure has influence on the presence of different protonic species, their dynamic equilibrium and on the conductivity of salts. The results reported in this study have been applied to improve the structural model of insoluble acidic salts. It is shown that an acidic potassium salt presents a mixture of neutral salt and unreacted acid. The nature of this mixture depends on the number of replaced protons-oxonium ions by cations. Preliminary measurements with synthesized compounds as solid electrolytes in fuel cells have been done, too. (C) 2010 Elsevier Ltd. All rights reserved.",
journal = "Materials Research Bulletin",
title = "Characterization of potassium salts of 12-tungstophosphoric acid",
volume = "45",
number = "11",
pages = "1679-1684",
doi = "10.1016/j.materresbull.2010.06.064"
}

Holclajtner-Antunović, I. D., Mioč, U. B., Todorović, M., Jovanović, Z. M., Davidović, M. P., Bajuk-Bogdanović, D. V.,& Laušević, Z.. (2010). Characterization of potassium salts of 12-tungstophosphoric acid. in Materials Research Bulletin, 45(11), 1679-1684.
https://doi.org/10.1016/j.materresbull.2010.06.064

Holclajtner-Antunović ID, Mioč UB, Todorović M, Jovanović ZM, Davidović MP, Bajuk-Bogdanović DV, Laušević Z. Characterization of potassium salts of 12-tungstophosphoric acid. in Materials Research Bulletin. 2010;45(11):1679-1684.
doi:10.1016/j.materresbull.2010.06.064 .

Holclajtner-Antunović, Ivanka D., Mioč, Ubavka B., Todorović, M., Jovanović, Zoran M., Davidović, Milorad P., Bajuk-Bogdanović, Danica V., Laušević, Zoran, "Characterization of potassium salts of 12-tungstophosphoric acid" in Materials Research Bulletin, 45, no. 11 (2010):1679-1684,
https://doi.org/10.1016/j.materresbull.2010.06.064 . .

TY  - JOUR
AU  - Bogdanović, Goran A.
AU  - Bonjakovic-Pavlović, Nada
AU  - Spasojević-de Bire, Anne
AU  - Ghermani, Nour Eddine
AU  - Mioč, Ubavka B.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3220
AB  - The X-ray structure of ammonium decavanadate hexahydrate was redetermined at a low temperature (100 K) in order to locate the hydrogen sites and to study the hydrogen bonds. The hydrogen atoms were assigned to the appropriate atomic group, NH4+ cations, and water molecules, missing to the best of our knowledge in the literature. A kappa refinement was performed to estimate the experimental atomic charges. These charges were used to generale the electrostatic potential on the molecular surfaces of decavanadate polyanions isolated from the influence of the crystal lattice. Comparisons with previous theoretical (ab initio) calculations were made and are also discussed.
T2  - Journal of the Serbian Chemical Society
T1  - Low temperature crystal structure, experimental atomic charges and electrostatic potential of ammonium decavanadate hexahydrate (NH4)V10O28 center dot 6H(2)O
VL  - 72
IS  - 6
SP  - 545
EP  - 554
DO  - 10.2298/JSC0706545B
ER  - 

@article{
author = "Bogdanović, Goran A. and Bonjakovic-Pavlović, Nada and Spasojević-de Bire, Anne and Ghermani, Nour Eddine and Mioč, Ubavka B.",
year = "2007",
abstract = "The X-ray structure of ammonium decavanadate hexahydrate was redetermined at a low temperature (100 K) in order to locate the hydrogen sites and to study the hydrogen bonds. The hydrogen atoms were assigned to the appropriate atomic group, NH4+ cations, and water molecules, missing to the best of our knowledge in the literature. A kappa refinement was performed to estimate the experimental atomic charges. These charges were used to generale the electrostatic potential on the molecular surfaces of decavanadate polyanions isolated from the influence of the crystal lattice. Comparisons with previous theoretical (ab initio) calculations were made and are also discussed.",
journal = "Journal of the Serbian Chemical Society",
title = "Low temperature crystal structure, experimental atomic charges and electrostatic potential of ammonium decavanadate hexahydrate (NH4)V10O28 center dot 6H(2)O",
volume = "72",
number = "6",
pages = "545-554",
doi = "10.2298/JSC0706545B"
}

Bogdanović, G. A., Bonjakovic-Pavlović, N., Spasojević-de Bire, A., Ghermani, N. E.,& Mioč, U. B.. (2007). Low temperature crystal structure, experimental atomic charges and electrostatic potential of ammonium decavanadate hexahydrate (NH4)V10O28 center dot 6H(2)O. in Journal of the Serbian Chemical Society, 72(6), 545-554.
https://doi.org/10.2298/JSC0706545B

Bogdanović GA, Bonjakovic-Pavlović N, Spasojević-de Bire A, Ghermani NE, Mioč UB. Low temperature crystal structure, experimental atomic charges and electrostatic potential of ammonium decavanadate hexahydrate (NH4)V10O28 center dot 6H(2)O. in Journal of the Serbian Chemical Society. 2007;72(6):545-554.
doi:10.2298/JSC0706545B .

Bogdanović, Goran A., Bonjakovic-Pavlović, Nada, Spasojević-de Bire, Anne, Ghermani, Nour Eddine, Mioč, Ubavka B., "Low temperature crystal structure, experimental atomic charges and electrostatic potential of ammonium decavanadate hexahydrate (NH4)V10O28 center dot 6H(2)O" in Journal of the Serbian Chemical Society, 72, no. 6 (2007):545-554,
https://doi.org/10.2298/JSC0706545B . .

TY  - JOUR
AU  - Mioč, Ubavka B.
AU  - Todorović, MR
AU  - Davidović, Milorad P.
AU  - Colomban, P
AU  - Holclajtner-Antunović, Ivanka D.
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2998
T2  - Solid State Ionics
T1  - Erratum: Heteropoly compounds - From proton conductors to biomedical agents (vol 176, pg 3005, 2005)
VL  - 177
IS  - 5-6
SP  - 623
EP  - 624
DO  - 10.1016/j.ssi.2005.12.018
ER  - 

@article{
author = "Mioč, Ubavka B. and Todorović, MR and Davidović, Milorad P. and Colomban, P and Holclajtner-Antunović, Ivanka D.",
year = "2006",
journal = "Solid State Ionics",
title = "Erratum: Heteropoly compounds - From proton conductors to biomedical agents (vol 176, pg 3005, 2005)",
volume = "177",
number = "5-6",
pages = "623-624",
doi = "10.1016/j.ssi.2005.12.018"
}

Mioč, U. B., Todorović, M., Davidović, M. P., Colomban, P.,& Holclajtner-Antunović, I. D.. (2006). Erratum: Heteropoly compounds - From proton conductors to biomedical agents (vol 176, pg 3005, 2005). in Solid State Ionics, 177(5-6), 623-624.
https://doi.org/10.1016/j.ssi.2005.12.018

Mioč UB, Todorović M, Davidović MP, Colomban P, Holclajtner-Antunović ID. Erratum: Heteropoly compounds - From proton conductors to biomedical agents (vol 176, pg 3005, 2005). in Solid State Ionics. 2006;177(5-6):623-624.
doi:10.1016/j.ssi.2005.12.018 .

Mioč, Ubavka B., Todorović, MR, Davidović, Milorad P., Colomban, P, Holclajtner-Antunović, Ivanka D., "Erratum: Heteropoly compounds - From proton conductors to biomedical agents (vol 176, pg 3005, 2005)" in Solid State Ionics, 177, no. 5-6 (2006):623-624,
https://doi.org/10.1016/j.ssi.2005.12.018 . .

TY  - JOUR
AU  - Uskoković-Marković, S.
AU  - Todorović, M.
AU  - Mioč, Ubavka B.
AU  - Holclajtner-Antunović, Ivanka D.
AU  - Andrić, Velibor
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3084
AB  - In this study, we have developed a sensitive, rapid and simple procedure for the energy dispersive X-ray fluorescence (EDXRF) spectrometry measurement of tungsten in tobacco plant parts. Only 0.1 g of dried plant material is needed instead of the usual I g. EDXRF spectrometry is used for quantitative measurement, after the foliar application of solutions of tungstophosphoric acid (WPA), its magnesium salt and compounds with glycine (Gly) and alanine (Ala), in exact quantities. After that, the leaves, trunks and summits were collected and prepared separately. Tungsten is determined directly in raw dried material, and the overlap of the tungsten peak with zincs that is present is avoided by the spectral deconvolution to obtain quantitative results. The prepared dry tablets weighed 100 mg, and measurement time was 2000 s. The radioisotope excitation source used was Cd-109 and tungsten was identified and quantified at the L-alpha 1 and L-alpha 2 lines at the energies of 8397.6eV and 8335.2eV, respectively. EDXRF spectrometry was applied in a wide range of concentrations (up to 2000 mg/kg), with an estimated detection concentration limit of 15 mg/kg, calculated on dried material. Quantitative analysis of different parts of the treated plant plus the washings gave 94.47% recovery of the applied tungsten in different compound forms. After the foliar application of investigated WPA compounds, there were noticed both vertical and horizontal distributions of tungsten through out the tobacco plants, according to the EDXRF spectrometry results. This conclusion is also in agreement with the positive effects of WPA on Tobacco mosaic tobamovirus (TMV) infection of Nicotiana tabacum (Solanaceae). (c) 2006 Elsevier B.V. All rights reserved.
T2  - Talanta
T1  - EDXRF spectrometry determination of tungsten in tobacco plants after antiviral treatment with 12-tungstophosphoric acid and its compounds
VL  - 70
IS  - 2
SP  - 301
EP  - 306
DO  - 10.1016/j.talanta.2006.02.041
ER  - 

@article{
author = "Uskoković-Marković, S. and Todorović, M. and Mioč, Ubavka B. and Holclajtner-Antunović, Ivanka D. and Andrić, Velibor",
year = "2006",
abstract = "In this study, we have developed a sensitive, rapid and simple procedure for the energy dispersive X-ray fluorescence (EDXRF) spectrometry measurement of tungsten in tobacco plant parts. Only 0.1 g of dried plant material is needed instead of the usual I g. EDXRF spectrometry is used for quantitative measurement, after the foliar application of solutions of tungstophosphoric acid (WPA), its magnesium salt and compounds with glycine (Gly) and alanine (Ala), in exact quantities. After that, the leaves, trunks and summits were collected and prepared separately. Tungsten is determined directly in raw dried material, and the overlap of the tungsten peak with zincs that is present is avoided by the spectral deconvolution to obtain quantitative results. The prepared dry tablets weighed 100 mg, and measurement time was 2000 s. The radioisotope excitation source used was Cd-109 and tungsten was identified and quantified at the L-alpha 1 and L-alpha 2 lines at the energies of 8397.6eV and 8335.2eV, respectively. EDXRF spectrometry was applied in a wide range of concentrations (up to 2000 mg/kg), with an estimated detection concentration limit of 15 mg/kg, calculated on dried material. Quantitative analysis of different parts of the treated plant plus the washings gave 94.47% recovery of the applied tungsten in different compound forms. After the foliar application of investigated WPA compounds, there were noticed both vertical and horizontal distributions of tungsten through out the tobacco plants, according to the EDXRF spectrometry results. This conclusion is also in agreement with the positive effects of WPA on Tobacco mosaic tobamovirus (TMV) infection of Nicotiana tabacum (Solanaceae). (c) 2006 Elsevier B.V. All rights reserved.",
journal = "Talanta",
title = "EDXRF spectrometry determination of tungsten in tobacco plants after antiviral treatment with 12-tungstophosphoric acid and its compounds",
volume = "70",
number = "2",
pages = "301-306",
doi = "10.1016/j.talanta.2006.02.041"
}

Uskoković-Marković, S., Todorović, M., Mioč, U. B., Holclajtner-Antunović, I. D.,& Andrić, V.. (2006). EDXRF spectrometry determination of tungsten in tobacco plants after antiviral treatment with 12-tungstophosphoric acid and its compounds. in Talanta, 70(2), 301-306.
https://doi.org/10.1016/j.talanta.2006.02.041

Uskoković-Marković S, Todorović M, Mioč UB, Holclajtner-Antunović ID, Andrić V. EDXRF spectrometry determination of tungsten in tobacco plants after antiviral treatment with 12-tungstophosphoric acid and its compounds. in Talanta. 2006;70(2):301-306.
doi:10.1016/j.talanta.2006.02.041 .

Uskoković-Marković, S., Todorović, M., Mioč, Ubavka B., Holclajtner-Antunović, Ivanka D., Andrić, Velibor, "EDXRF spectrometry determination of tungsten in tobacco plants after antiviral treatment with 12-tungstophosphoric acid and its compounds" in Talanta, 70, no. 2 (2006):301-306,
https://doi.org/10.1016/j.talanta.2006.02.041 . .

TY  - JOUR
AU  - Cajkovski, T
AU  - Davidović, Miloš D.
AU  - Pissis, P
AU  - Polizos, G
AU  - Cajkovski, D
AU  - Likar-Smiljanic, V
AU  - Sredic, S
AU  - Mioč, Ubavka B.
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6548
AB  - Aluminum-pillared montmorillonite (PILC MM) was doped with 12-tungstophosphoric acid hexahydrate (WPA-6) by the Solgel method. Using broad band dielectric relaxation spectroscopy (DRS), electrical properties of the obtained material were investigated. Thermally stimulated depolarization current technique was also used due to its high sensitivity and high resolving power. It has been established that pillared montmorillonite doped with WPA-6 (H3PW12O40 center dot 6H(2)O) shows conductivity higher than that of the pure components. Phase transition, which in WPA-6 takes place above 50 degrees C, in doped montmorillonite occurs above 70 degrees C. The conductivity activation energy is 0.27 eV. (c) 2005 Elsevier B.V. All rights reserved.
T2  - Journal of Non-crystalline Solids
T1  - Dielectric relaxation spectroscopy of montmorillonite doped with 12-tungstophosphoric acid
VL  - 351
IS  - 33-36
SP  - 2842
EP  - 2848
DO  - 10.1016/j.jnoncrysol.2005.05.032
ER  - 

@article{
author = "Cajkovski, T and Davidović, Miloš D. and Pissis, P and Polizos, G and Cajkovski, D and Likar-Smiljanic, V and Sredic, S and Mioč, Ubavka B.",
year = "2005",
abstract = "Aluminum-pillared montmorillonite (PILC MM) was doped with 12-tungstophosphoric acid hexahydrate (WPA-6) by the Solgel method. Using broad band dielectric relaxation spectroscopy (DRS), electrical properties of the obtained material were investigated. Thermally stimulated depolarization current technique was also used due to its high sensitivity and high resolving power. It has been established that pillared montmorillonite doped with WPA-6 (H3PW12O40 center dot 6H(2)O) shows conductivity higher than that of the pure components. Phase transition, which in WPA-6 takes place above 50 degrees C, in doped montmorillonite occurs above 70 degrees C. The conductivity activation energy is 0.27 eV. (c) 2005 Elsevier B.V. All rights reserved.",
journal = "Journal of Non-crystalline Solids",
title = "Dielectric relaxation spectroscopy of montmorillonite doped with 12-tungstophosphoric acid",
volume = "351",
number = "33-36",
pages = "2842-2848",
doi = "10.1016/j.jnoncrysol.2005.05.032"
}

Cajkovski, T., Davidović, M. D., Pissis, P., Polizos, G., Cajkovski, D., Likar-Smiljanic, V., Sredic, S.,& Mioč, U. B.. (2005). Dielectric relaxation spectroscopy of montmorillonite doped with 12-tungstophosphoric acid. in Journal of Non-crystalline Solids, 351(33-36), 2842-2848.
https://doi.org/10.1016/j.jnoncrysol.2005.05.032

Cajkovski T, Davidović MD, Pissis P, Polizos G, Cajkovski D, Likar-Smiljanic V, Sredic S, Mioč UB. Dielectric relaxation spectroscopy of montmorillonite doped with 12-tungstophosphoric acid. in Journal of Non-crystalline Solids. 2005;351(33-36):2842-2848.
doi:10.1016/j.jnoncrysol.2005.05.032 .

Cajkovski, T, Davidović, Miloš D., Pissis, P, Polizos, G, Cajkovski, D, Likar-Smiljanic, V, Sredic, S, Mioč, Ubavka B., "Dielectric relaxation spectroscopy of montmorillonite doped with 12-tungstophosphoric acid" in Journal of Non-crystalline Solids, 351, no. 33-36 (2005):2842-2848,
https://doi.org/10.1016/j.jnoncrysol.2005.05.032 . .

TY  - JOUR
AU  - Jokanović, Vukoman R.
AU  - Mioč, Ubavka B.
AU  - Nedić, Zoran
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6560
AB  - Ultrasonic spray pyrolysis has been used to obtain fine spherical powders of WPA bronzes from a 29-tungstenphosphoric acid (WPA-29) feed solution. The average grain size of the obtained powder particles is ca. 1000 nm; these consist of subparticles in the 30-80 run range. The experimentally determined average WPA bronze particle size values are compared with theoretically calculated ones; fairly good agreement between them is found. It is also shown that the average grain size and grain size distribution of the structure and substructure of the obtained powder are predictable. (c) 2005 Elsevier B.V. All rights reserved.
T2  - Solid State Ionics
T1  - Nanostructured phosphorous tungsten bronzes from ultrasonic spray pyrolysis
VL  - 176
IS  - 39-40
SP  - 2955
EP  - 2956
DO  - 10.1016/j.ssi.2005.09.029
ER  - 

@article{
author = "Jokanović, Vukoman R. and Mioč, Ubavka B. and Nedić, Zoran",
year = "2005",
abstract = "Ultrasonic spray pyrolysis has been used to obtain fine spherical powders of WPA bronzes from a 29-tungstenphosphoric acid (WPA-29) feed solution. The average grain size of the obtained powder particles is ca. 1000 nm; these consist of subparticles in the 30-80 run range. The experimentally determined average WPA bronze particle size values are compared with theoretically calculated ones; fairly good agreement between them is found. It is also shown that the average grain size and grain size distribution of the structure and substructure of the obtained powder are predictable. (c) 2005 Elsevier B.V. All rights reserved.",
journal = "Solid State Ionics",
title = "Nanostructured phosphorous tungsten bronzes from ultrasonic spray pyrolysis",
volume = "176",
number = "39-40",
pages = "2955-2956",
doi = "10.1016/j.ssi.2005.09.029"
}

Jokanović, V. R., Mioč, U. B.,& Nedić, Z.. (2005). Nanostructured phosphorous tungsten bronzes from ultrasonic spray pyrolysis. in Solid State Ionics, 176(39-40), 2955-2956.
https://doi.org/10.1016/j.ssi.2005.09.029

Jokanović VR, Mioč UB, Nedić Z. Nanostructured phosphorous tungsten bronzes from ultrasonic spray pyrolysis. in Solid State Ionics. 2005;176(39-40):2955-2956.
doi:10.1016/j.ssi.2005.09.029 .

Jokanović, Vukoman R., Mioč, Ubavka B., Nedić, Zoran, "Nanostructured phosphorous tungsten bronzes from ultrasonic spray pyrolysis" in Solid State Ionics, 176, no. 39-40 (2005):2955-2956,
https://doi.org/10.1016/j.ssi.2005.09.029 . .

TY  - JOUR
AU  - Mioč, Ubavka B.
AU  - Todorovic, MR
AU  - Davidovic, A
AU  - Colomban, P
AU  - Holclajtner-Antunović, Ivanka D.
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6561
AB  - Heteropoly compounds (HPCs) have been a matter of interest in basic and applied science for more than a century. From their first synthesis, many advances have been made to promote the use of HPCs in different ways in science and technology. The aim of this article is to review the main structural characteristics of heteropoly compounds of the Keggin type (12-tungstophosphoric, 12-molybdophosphoric, 12-tungstosilicic acids; alkaline and alkaline earth salts of 12-tungstophosphoric acid and gels doped with HPCs) to understand and explain their different activities, such as high proton conductivity, and catalytic, biochemical and biomedical activities. (c) 2005 Elsevier B.V. All rights reserved.
T2  - Solid State Ionics
T1  - Heteropoly compounds - From proton conductors to biomedical agents
VL  - 176
IS  - 39-40
SP  - 3005
EP  - 3017
DO  - 10.1016/j.ssi.2005.09.056
ER  - 

@article{
author = "Mioč, Ubavka B. and Todorovic, MR and Davidovic, A and Colomban, P and Holclajtner-Antunović, Ivanka D.",
year = "2005",
abstract = "Heteropoly compounds (HPCs) have been a matter of interest in basic and applied science for more than a century. From their first synthesis, many advances have been made to promote the use of HPCs in different ways in science and technology. The aim of this article is to review the main structural characteristics of heteropoly compounds of the Keggin type (12-tungstophosphoric, 12-molybdophosphoric, 12-tungstosilicic acids; alkaline and alkaline earth salts of 12-tungstophosphoric acid and gels doped with HPCs) to understand and explain their different activities, such as high proton conductivity, and catalytic, biochemical and biomedical activities. (c) 2005 Elsevier B.V. All rights reserved.",
journal = "Solid State Ionics",
title = "Heteropoly compounds - From proton conductors to biomedical agents",
volume = "176",
number = "39-40",
pages = "3005-3017",
doi = "10.1016/j.ssi.2005.09.056"
}

Mioč, U. B., Todorovic, M., Davidovic, A., Colomban, P.,& Holclajtner-Antunović, I. D.. (2005). Heteropoly compounds - From proton conductors to biomedical agents. in Solid State Ionics, 176(39-40), 3005-3017.
https://doi.org/10.1016/j.ssi.2005.09.056

Mioč UB, Todorovic M, Davidovic A, Colomban P, Holclajtner-Antunović ID. Heteropoly compounds - From proton conductors to biomedical agents. in Solid State Ionics. 2005;176(39-40):3005-3017.
doi:10.1016/j.ssi.2005.09.056 .

Mioč, Ubavka B., Todorovic, MR, Davidovic, A, Colomban, P, Holclajtner-Antunović, Ivanka D., "Heteropoly compounds - From proton conductors to biomedical agents" in Solid State Ionics, 176, no. 39-40 (2005):3005-3017,
https://doi.org/10.1016/j.ssi.2005.09.056 . .

TY  - JOUR
AU  - Davidovic, A
AU  - Cajkovski, T
AU  - Colomban, P
AU  - Mioč, Ubavka B.
AU  - Likar-Smiljanic, V
AU  - Cajkovski, D
AU  - Biljic, R
AU  - Nedić, Zoran
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6559
AB  - The effect of monovalent and bivalent cations on some electrical properties of 12-tungstophosphoric acid (WPA) salts were studied. The charge carriers in this acid are protonic entities such as H+, OH- and various forms of hydrated proton H(H2O)(n)(+). Conductivity, dielectric relaxations and activation energies of WPA were investigated. Permittivity measurements were performed on pressed polycrystalline pellets at lower frequencies (5 Hz-500 kHz) and in the X-band microwave range (8-12 GHz); the temperature interval was from room temperature to 360 K. In the microwave region, WPA hexahydrate (WPA-6) and some IATA salts exhibit one, two or three relaxations of the Debye type. Their relaxation times of the order of 10(-11) s are attributed to the fast reorientation of water molecules and/or fast reorientation of oxonium ions (H3O+). In the lower frequency interval, dielectric relaxations of WPA-6 and some IATA salts with longer relaxation times of the order of 10(-7)-10(-5) s were registered and assigned to ion (H+ and/or H3O+) and cation jumps. (c) 2005 Elsevier B.V. All rights reserved.
T2  - Solid State Ionics
T1  - The influence of monovalent and bivalent cations on the electrical properties of 12-Tungstophosphoric acid salts
VL  - 176
IS  - 39-40
SP  - 2881
EP  - 2885
DO  - 10.1016/j.ssi.2005.09.020
ER  - 

@article{
author = "Davidovic, A and Cajkovski, T and Colomban, P and Mioč, Ubavka B. and Likar-Smiljanic, V and Cajkovski, D and Biljic, R and Nedić, Zoran",
year = "2005",
abstract = "The effect of monovalent and bivalent cations on some electrical properties of 12-tungstophosphoric acid (WPA) salts were studied. The charge carriers in this acid are protonic entities such as H+, OH- and various forms of hydrated proton H(H2O)(n)(+). Conductivity, dielectric relaxations and activation energies of WPA were investigated. Permittivity measurements were performed on pressed polycrystalline pellets at lower frequencies (5 Hz-500 kHz) and in the X-band microwave range (8-12 GHz); the temperature interval was from room temperature to 360 K. In the microwave region, WPA hexahydrate (WPA-6) and some IATA salts exhibit one, two or three relaxations of the Debye type. Their relaxation times of the order of 10(-11) s are attributed to the fast reorientation of water molecules and/or fast reorientation of oxonium ions (H3O+). In the lower frequency interval, dielectric relaxations of WPA-6 and some IATA salts with longer relaxation times of the order of 10(-7)-10(-5) s were registered and assigned to ion (H+ and/or H3O+) and cation jumps. (c) 2005 Elsevier B.V. All rights reserved.",
journal = "Solid State Ionics",
title = "The influence of monovalent and bivalent cations on the electrical properties of 12-Tungstophosphoric acid salts",
volume = "176",
number = "39-40",
pages = "2881-2885",
doi = "10.1016/j.ssi.2005.09.020"
}

Davidovic, A., Cajkovski, T., Colomban, P., Mioč, U. B., Likar-Smiljanic, V., Cajkovski, D., Biljic, R.,& Nedić, Z.. (2005). The influence of monovalent and bivalent cations on the electrical properties of 12-Tungstophosphoric acid salts. in Solid State Ionics, 176(39-40), 2881-2885.
https://doi.org/10.1016/j.ssi.2005.09.020

Davidovic A, Cajkovski T, Colomban P, Mioč UB, Likar-Smiljanic V, Cajkovski D, Biljic R, Nedić Z. The influence of monovalent and bivalent cations on the electrical properties of 12-Tungstophosphoric acid salts. in Solid State Ionics. 2005;176(39-40):2881-2885.
doi:10.1016/j.ssi.2005.09.020 .

Davidovic, A, Cajkovski, T, Colomban, P, Mioč, Ubavka B., Likar-Smiljanic, V, Cajkovski, D, Biljic, R, Nedić, Zoran, "The influence of monovalent and bivalent cations on the electrical properties of 12-Tungstophosphoric acid salts" in Solid State Ionics, 176, no. 39-40 (2005):2881-2885,
https://doi.org/10.1016/j.ssi.2005.09.020 . .

TY  - JOUR
AU  - Skipina, B
AU  - Cajkovski, T
AU  - Davidović, Milorad P.
AU  - Cajkovski, D
AU  - Likar-Smiljanic, V
AU  - Mioč, Ubavka B.
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6522
AB  - In our previous work we investigated the conductivity and dielectric relaxation phenomena in heteropoly acids and their salts. In this work, we have studied the conductivity of grains and grain boundaries in compressed powders of 12-tungstophosphoric acid (WPA) salts with univalent and bivalent ions. The method of impedance spectroscopy has been employed in the frequency range from 5 Hz to 500 kHz. We obtained grains and grain boundaries conductivities as well as corresponding activation energies. Grain conductivity in all investigated salts is always higher than the grain boundary conductivity.
T2  - Materials Science Forum
T1  - Conductivity of grains and grain boundaries in polycrystalline heteropoly acid salts
VL  - 494
SP  - 101
EP  - 106
DO  - 10.4028/www.scientific.net/MSF.494.101
ER  - 

@article{
author = "Skipina, B and Cajkovski, T and Davidović, Milorad P. and Cajkovski, D and Likar-Smiljanic, V and Mioč, Ubavka B.",
year = "2005",
abstract = "In our previous work we investigated the conductivity and dielectric relaxation phenomena in heteropoly acids and their salts. In this work, we have studied the conductivity of grains and grain boundaries in compressed powders of 12-tungstophosphoric acid (WPA) salts with univalent and bivalent ions. The method of impedance spectroscopy has been employed in the frequency range from 5 Hz to 500 kHz. We obtained grains and grain boundaries conductivities as well as corresponding activation energies. Grain conductivity in all investigated salts is always higher than the grain boundary conductivity.",
journal = "Materials Science Forum",
title = "Conductivity of grains and grain boundaries in polycrystalline heteropoly acid salts",
volume = "494",
pages = "101-106",
doi = "10.4028/www.scientific.net/MSF.494.101"
}

Skipina, B., Cajkovski, T., Davidović, M. P., Cajkovski, D., Likar-Smiljanic, V.,& Mioč, U. B.. (2005). Conductivity of grains and grain boundaries in polycrystalline heteropoly acid salts. in Materials Science Forum, 494, 101-106.
https://doi.org/10.4028/www.scientific.net/MSF.494.101

Skipina B, Cajkovski T, Davidović MP, Cajkovski D, Likar-Smiljanic V, Mioč UB. Conductivity of grains and grain boundaries in polycrystalline heteropoly acid salts. in Materials Science Forum. 2005;494:101-106.
doi:10.4028/www.scientific.net/MSF.494.101 .

Skipina, B, Cajkovski, T, Davidović, Milorad P., Cajkovski, D, Likar-Smiljanic, V, Mioč, Ubavka B., "Conductivity of grains and grain boundaries in polycrystalline heteropoly acid salts" in Materials Science Forum, 494 (2005):101-106,
https://doi.org/10.4028/www.scientific.net/MSF.494.101 . .

TY  - CONF
AU  - Bošnjaković-Pavlović, Nada
AU  - Ghermani, Nour Eddine
AU  - Spasojević-de Bire, Anne
AU  - Bogdanović, Goran A.
AU  - Mioč, Ubavka B.
PY  - 2004
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9575
AB  - The X-ray structure of ammonium decavanadate hexahydrate, (NH4)6V10O28·6H2O, was redetermined at low temperature (100 K) in order to locate the hydrogen sites. A kappa refinement was performed to estimate the experimental atomic charges. Comparisons with previous theoretical calculation results were discussed.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2004: 7th international conference on fundemental and applied aspract of physical chemistry
T1  - Crystal structure redetermination and atomic charges of ammonium decavanadate hexahydrate based on a low temperature x-ray experiment
VL  - 2
SP  - 544
EP  - 546
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9575
ER  - 

@conference{
author = "Bošnjaković-Pavlović, Nada and Ghermani, Nour Eddine and Spasojević-de Bire, Anne and Bogdanović, Goran A. and Mioč, Ubavka B.",
year = "2004",
abstract = "The X-ray structure of ammonium decavanadate hexahydrate, (NH4)6V10O28·6H2O, was redetermined at low temperature (100 K) in order to locate the hydrogen sites. A kappa refinement was performed to estimate the experimental atomic charges. Comparisons with previous theoretical calculation results were discussed.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2004: 7th international conference on fundemental and applied aspract of physical chemistry",
title = "Crystal structure redetermination and atomic charges of ammonium decavanadate hexahydrate based on a low temperature x-ray experiment",
volume = "2",
pages = "544-546",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9575"
}

Bošnjaković-Pavlović, N., Ghermani, N. E., Spasojević-de Bire, A., Bogdanović, G. A.,& Mioč, U. B.. (2004). Crystal structure redetermination and atomic charges of ammonium decavanadate hexahydrate based on a low temperature x-ray experiment. in Physical chemistry 2004: 7th international conference on fundemental and applied aspract of physical chemistry
Society of Physical Chemists of Serbia., 2, 544-546.
https://hdl.handle.net/21.15107/rcub_vinar_9575

Bošnjaković-Pavlović N, Ghermani NE, Spasojević-de Bire A, Bogdanović GA, Mioč UB. Crystal structure redetermination and atomic charges of ammonium decavanadate hexahydrate based on a low temperature x-ray experiment. in Physical chemistry 2004: 7th international conference on fundemental and applied aspract of physical chemistry. 2004;2:544-546.
https://hdl.handle.net/21.15107/rcub_vinar_9575 .

Bošnjaković-Pavlović, Nada, Ghermani, Nour Eddine, Spasojević-de Bire, Anne, Bogdanović, Goran A., Mioč, Ubavka B., "Crystal structure redetermination and atomic charges of ammonium decavanadate hexahydrate based on a low temperature x-ray experiment" in Physical chemistry 2004: 7th international conference on fundemental and applied aspract of physical chemistry, 2 (2004):544-546,
https://hdl.handle.net/21.15107/rcub_vinar_9575 .

TY  - JOUR
AU  - Sredic, S
AU  - Cajkovski, T
AU  - Davidović, Miloš D.
AU  - Cajkovski, D
AU  - Likar-Smiljanic, V
AU  - Marinović-Cincović, Milena
AU  - Mioč, Ubavka B.
AU  - Nedić, Zoran
AU  - Biljic, R
PY  - 2004
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6422
AB  - Bentonite a natural raw material from the Sipovo mining deposits (Republic of Srpska), which contains a high percentage of montmorillonite, was treated to obtain montmorillonite clay ready for further investigations. Al-pillared montmorillonite was doped with 12-tungstophosphoric acid (WPA) by the sol-gel method. Substantial increase in proton conductivity of this new material was achieved. Different physicochemical methods were used to characterize new materials such as X-ray powder diffraction (XRD), thermogravimetric (TG) analysis, porosity measurements, scanning electron microscopy (SEM), and infrared measurements (IR). Impedance spectroscopy technique was applied in order to study the proton conductivity and its dependence on the frequency and tungstophosphoric acid concentration.
T2  - Materials Science Forum
T1  - Physicochemical properties of Al-pillared montmorillonite doped with 12-tungstophosphoric acid
VL  - 453-454
SP  - 157
EP  - 162
DO  - 10.4028/www.scientific.net/MSF.453-454.157
ER  - 

@article{
author = "Sredic, S and Cajkovski, T and Davidović, Miloš D. and Cajkovski, D and Likar-Smiljanic, V and Marinović-Cincović, Milena and Mioč, Ubavka B. and Nedić, Zoran and Biljic, R",
year = "2004",
abstract = "Bentonite a natural raw material from the Sipovo mining deposits (Republic of Srpska), which contains a high percentage of montmorillonite, was treated to obtain montmorillonite clay ready for further investigations. Al-pillared montmorillonite was doped with 12-tungstophosphoric acid (WPA) by the sol-gel method. Substantial increase in proton conductivity of this new material was achieved. Different physicochemical methods were used to characterize new materials such as X-ray powder diffraction (XRD), thermogravimetric (TG) analysis, porosity measurements, scanning electron microscopy (SEM), and infrared measurements (IR). Impedance spectroscopy technique was applied in order to study the proton conductivity and its dependence on the frequency and tungstophosphoric acid concentration.",
journal = "Materials Science Forum",
title = "Physicochemical properties of Al-pillared montmorillonite doped with 12-tungstophosphoric acid",
volume = "453-454",
pages = "157-162",
doi = "10.4028/www.scientific.net/MSF.453-454.157"
}

Sredic, S., Cajkovski, T., Davidović, M. D., Cajkovski, D., Likar-Smiljanic, V., Marinović-Cincović, M., Mioč, U. B., Nedić, Z.,& Biljic, R.. (2004). Physicochemical properties of Al-pillared montmorillonite doped with 12-tungstophosphoric acid. in Materials Science Forum, 453-454, 157-162.
https://doi.org/10.4028/www.scientific.net/MSF.453-454.157

Sredic S, Cajkovski T, Davidović MD, Cajkovski D, Likar-Smiljanic V, Marinović-Cincović M, Mioč UB, Nedić Z, Biljic R. Physicochemical properties of Al-pillared montmorillonite doped with 12-tungstophosphoric acid. in Materials Science Forum. 2004;453-454:157-162.
doi:10.4028/www.scientific.net/MSF.453-454.157 .

Sredic, S, Cajkovski, T, Davidović, Miloš D., Cajkovski, D, Likar-Smiljanic, V, Marinović-Cincović, Milena, Mioč, Ubavka B., Nedić, Zoran, Biljic, R, "Physicochemical properties of Al-pillared montmorillonite doped with 12-tungstophosphoric acid" in Materials Science Forum, 453-454 (2004):157-162,
https://doi.org/10.4028/www.scientific.net/MSF.453-454.157 . .

TY  - JOUR
AU  - Cajkovski, T
AU  - Davidović, Miloš D.
AU  - Pissis, P
AU  - Polizos, G
AU  - Cajkovski, D
AU  - Likar-Smiljanic, V
AU  - Biljic, R
AU  - Nedić, Zoran
AU  - Mioč, Ubavka B.
PY  - 2003
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6383
AB  - The electrical and dielectric properties of the copper salt of 12-tungstophosphoric acid (WPA) hydrate have been investigated by broadband dielectric relaxation spectroscopy (DRS). This work is a continuation of our previous investigations on the influence of monovalent and bivalent cations on the dielectric properties of WPA hydrates salts. Measurements were made in the frequency range 10 mHz-1 MHz in order to explore the long-range dynamics, following recent microwave measurements aiming at the local dynamics properties. Experiments were done in the temperature interval 293-350 K. Data treatment included complex permittivity epsilon*, complex electric modulus M* and complex impedance Z* formalism, Arrhenius diagram and Cole-Cole diagrams. The results are discussed in terms of conductivity relaxation and conductivity current relaxation. Rather long conductivity relaxation times measured seem to correspond to ion jumping processes. A phase transition was observed at 323 K. (C) 2003 Elsevier B.V. All rights reserved.
T2  - Solid State Ionics
T1  - Dielectric investigation of electrical conductivity in the copper salt of the 12-tungstophosphoric acid hydrate
VL  - 162
SP  - 203
EP  - 208
DO  - 10.1016/S0167-2738(03)00233-9
ER  - 

@article{
author = "Cajkovski, T and Davidović, Miloš D. and Pissis, P and Polizos, G and Cajkovski, D and Likar-Smiljanic, V and Biljic, R and Nedić, Zoran and Mioč, Ubavka B.",
year = "2003",
abstract = "The electrical and dielectric properties of the copper salt of 12-tungstophosphoric acid (WPA) hydrate have been investigated by broadband dielectric relaxation spectroscopy (DRS). This work is a continuation of our previous investigations on the influence of monovalent and bivalent cations on the dielectric properties of WPA hydrates salts. Measurements were made in the frequency range 10 mHz-1 MHz in order to explore the long-range dynamics, following recent microwave measurements aiming at the local dynamics properties. Experiments were done in the temperature interval 293-350 K. Data treatment included complex permittivity epsilon*, complex electric modulus M* and complex impedance Z* formalism, Arrhenius diagram and Cole-Cole diagrams. The results are discussed in terms of conductivity relaxation and conductivity current relaxation. Rather long conductivity relaxation times measured seem to correspond to ion jumping processes. A phase transition was observed at 323 K. (C) 2003 Elsevier B.V. All rights reserved.",
journal = "Solid State Ionics",
title = "Dielectric investigation of electrical conductivity in the copper salt of the 12-tungstophosphoric acid hydrate",
volume = "162",
pages = "203-208",
doi = "10.1016/S0167-2738(03)00233-9"
}

Cajkovski, T., Davidović, M. D., Pissis, P., Polizos, G., Cajkovski, D., Likar-Smiljanic, V., Biljic, R., Nedić, Z.,& Mioč, U. B.. (2003). Dielectric investigation of electrical conductivity in the copper salt of the 12-tungstophosphoric acid hydrate. in Solid State Ionics, 162, 203-208.
https://doi.org/10.1016/S0167-2738(03)00233-9

Cajkovski T, Davidović MD, Pissis P, Polizos G, Cajkovski D, Likar-Smiljanic V, Biljic R, Nedić Z, Mioč UB. Dielectric investigation of electrical conductivity in the copper salt of the 12-tungstophosphoric acid hydrate. in Solid State Ionics. 2003;162:203-208.
doi:10.1016/S0167-2738(03)00233-9 .

Cajkovski, T, Davidović, Miloš D., Pissis, P, Polizos, G, Cajkovski, D, Likar-Smiljanic, V, Biljic, R, Nedić, Zoran, Mioč, Ubavka B., "Dielectric investigation of electrical conductivity in the copper salt of the 12-tungstophosphoric acid hydrate" in Solid State Ionics, 162 (2003):203-208,
https://doi.org/10.1016/S0167-2738(03)00233-9 . .

TY  - JOUR
AU  - Mioč, Ubavka B.
AU  - Todorovic, MR
AU  - Uskoković-Marković, SM
AU  - Davidović, Milorad P.
AU  - Kremenović, Aleksandar S.
AU  - Spasojević-de Bire, Anne
AU  - Cajkovski, T
AU  - Likar-Smiljanic, V
AU  - Biljic, R
PY  - 2003
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6384
AB  - Some structural properties of a magnesium salt of 12-tungstophosphoric acid, MgHPW12O40.nH(2)O (MgHVvTA-n), are reported. The influence of the Mg2+ ion on the structure, dynamics of the protonic species, and dielectric and conductive characteristics of the salt have been studied. The interaction of protonic species with Keggin anion was discussed. Preliminary results of the crystal structure indicate that the structure is composed of Keggin anions and Mg(OH2)(6) aqua-complexes. Some comparisons are made with other alkaline-earth and alkaline salts of WPA. The results of thermal analysis (TGA and DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), conductivity and permittivity measurements of MgHWPA-n are reported and discussed. (C) 2003 Elsevier B.V. All rights reserved.
T2  - Solid State Ionics
T1  - Structure and proton conductivity in a magnesium salt of 12-tungstophosphoric acid
VL  - 162
SP  - 217
EP  - 223
DO  - 10.1016/S0167-2738(03)00257-1
ER  - 

@article{
author = "Mioč, Ubavka B. and Todorovic, MR and Uskoković-Marković, SM and Davidović, Milorad P. and Kremenović, Aleksandar S. and Spasojević-de Bire, Anne and Cajkovski, T and Likar-Smiljanic, V and Biljic, R",
year = "2003",
abstract = "Some structural properties of a magnesium salt of 12-tungstophosphoric acid, MgHPW12O40.nH(2)O (MgHVvTA-n), are reported. The influence of the Mg2+ ion on the structure, dynamics of the protonic species, and dielectric and conductive characteristics of the salt have been studied. The interaction of protonic species with Keggin anion was discussed. Preliminary results of the crystal structure indicate that the structure is composed of Keggin anions and Mg(OH2)(6) aqua-complexes. Some comparisons are made with other alkaline-earth and alkaline salts of WPA. The results of thermal analysis (TGA and DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), conductivity and permittivity measurements of MgHWPA-n are reported and discussed. (C) 2003 Elsevier B.V. All rights reserved.",
journal = "Solid State Ionics",
title = "Structure and proton conductivity in a magnesium salt of 12-tungstophosphoric acid",
volume = "162",
pages = "217-223",
doi = "10.1016/S0167-2738(03)00257-1"
}

Mioč, U. B., Todorovic, M., Uskoković-Marković, S., Davidović, M. P., Kremenović, A. S., Spasojević-de Bire, A., Cajkovski, T., Likar-Smiljanic, V.,& Biljic, R.. (2003). Structure and proton conductivity in a magnesium salt of 12-tungstophosphoric acid. in Solid State Ionics, 162, 217-223.
https://doi.org/10.1016/S0167-2738(03)00257-1

Mioč UB, Todorovic M, Uskoković-Marković S, Davidović MP, Kremenović AS, Spasojević-de Bire A, Cajkovski T, Likar-Smiljanic V, Biljic R. Structure and proton conductivity in a magnesium salt of 12-tungstophosphoric acid. in Solid State Ionics. 2003;162:217-223.
doi:10.1016/S0167-2738(03)00257-1 .

Mioč, Ubavka B., Todorovic, MR, Uskoković-Marković, SM, Davidović, Milorad P., Kremenović, Aleksandar S., Spasojević-de Bire, Anne, Cajkovski, T, Likar-Smiljanic, V, Biljic, R, "Structure and proton conductivity in a magnesium salt of 12-tungstophosphoric acid" in Solid State Ionics, 162 (2003):217-223,
https://doi.org/10.1016/S0167-2738(03)00257-1 . .

TY  - JOUR
AU  - Cajkovski, T
AU  - Davidović, Milorad P.
AU  - Cajkovski, D
AU  - Likar-Smiljanic, V
AU  - Biljic, R
AU  - Mioč, Ubavka B.
AU  - Todorović, M
PY  - 2003
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6349
AB  - The main aim of this paper is to investigate the effects of gamma-irradiation on dielectric properties of barium salt of 12-tungstophosphoric acid (WPA) hydrate BaHPW12O40-7H(2)O (BaHWPA(.)7). Irradiation was carried out with two doses. Permittivity measurements have been performed in microwave X-band, at room temperature. After the irradiation (the absorbed dose 940 kGy) visible effect is the slight yellow color of the specimen and both real part epsilon and imaginary p I art epsilon of permittivity curves are shifted along the frequency axis. By measuring permittivity several days in succession gradual recovery of the specimen was observed. After five days epsilon and epsilon curves returned to their initial values on the frequency axis, and the color also disappeared. The second irradiation of the same specimen (1880 kGy) resulted in somewhat larger shift of epsilon and epsilon towards lower frequencies. This time, with larger absorbed dose there was no recovery effect and no-coloration. IR spectra of unirradiated and irradiated specimens were recorded and obtained data used for explanation of the observed phenomena.
T2  - Materials Science Forum
T1  - Effects of gamma-irradiation on the dielectric properties of the barium salt of 12-tungstophosphoric acid hydrate
VL  - 413
SP  - 141
EP  - 145
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6349
ER  - 

@article{
author = "Cajkovski, T and Davidović, Milorad P. and Cajkovski, D and Likar-Smiljanic, V and Biljic, R and Mioč, Ubavka B. and Todorović, M",
year = "2003",
abstract = "The main aim of this paper is to investigate the effects of gamma-irradiation on dielectric properties of barium salt of 12-tungstophosphoric acid (WPA) hydrate BaHPW12O40-7H(2)O (BaHWPA(.)7). Irradiation was carried out with two doses. Permittivity measurements have been performed in microwave X-band, at room temperature. After the irradiation (the absorbed dose 940 kGy) visible effect is the slight yellow color of the specimen and both real part epsilon and imaginary p I art epsilon of permittivity curves are shifted along the frequency axis. By measuring permittivity several days in succession gradual recovery of the specimen was observed. After five days epsilon and epsilon curves returned to their initial values on the frequency axis, and the color also disappeared. The second irradiation of the same specimen (1880 kGy) resulted in somewhat larger shift of epsilon and epsilon towards lower frequencies. This time, with larger absorbed dose there was no recovery effect and no-coloration. IR spectra of unirradiated and irradiated specimens were recorded and obtained data used for explanation of the observed phenomena.",
journal = "Materials Science Forum",
title = "Effects of gamma-irradiation on the dielectric properties of the barium salt of 12-tungstophosphoric acid hydrate",
volume = "413",
pages = "141-145",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6349"
}

Cajkovski, T., Davidović, M. P., Cajkovski, D., Likar-Smiljanic, V., Biljic, R., Mioč, U. B.,& Todorović, M.. (2003). Effects of gamma-irradiation on the dielectric properties of the barium salt of 12-tungstophosphoric acid hydrate. in Materials Science Forum, 413, 141-145.
https://hdl.handle.net/21.15107/rcub_vinar_6349

Cajkovski T, Davidović MP, Cajkovski D, Likar-Smiljanic V, Biljic R, Mioč UB, Todorović M. Effects of gamma-irradiation on the dielectric properties of the barium salt of 12-tungstophosphoric acid hydrate. in Materials Science Forum. 2003;413:141-145.
https://hdl.handle.net/21.15107/rcub_vinar_6349 .

Cajkovski, T, Davidović, Milorad P., Cajkovski, D, Likar-Smiljanic, V, Biljic, R, Mioč, Ubavka B., Todorović, M, "Effects of gamma-irradiation on the dielectric properties of the barium salt of 12-tungstophosphoric acid hydrate" in Materials Science Forum, 413 (2003):141-145,
https://hdl.handle.net/21.15107/rcub_vinar_6349 .

TY  - JOUR
AU  - Davidović, Miloš D.
AU  - Cajkovski, T
AU  - Cajkovski, D
AU  - Likar-Smiljanic, V
AU  - Biljic, R
AU  - Mioč, Ubavka B.
AU  - Nedić, Zoran
PY  - 2002
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2509
AB  - Barium salt of 12-tungstophosphoric acid (WPA) hydrate BaHPW12O40.7H(2)O (BaHWPA-7H20) has been investigated both in the microwave (X-band) region and in the lower frequency (5 Hz-500 kHz) region. This work is a continuation of our previous investigations on the influence of monovalent and bivalent cations on the dielectric properties of WPA hydrate salts. The real and imaginary parts of the permittivity (epsilon, epsilon) as a function of frequency and temperature, were determined in both frequency regions. The observed relaxations were attributed to specific relaxation processes. In the lower frequency range, the relaxation time tau=1.0 x 10(-6) s was assigned to barium ion jumps. In the microwave region, the dielectric relaxation time tau =1.7 x 10(-11) s was attributed to polyatomic ions (H3O+) and/or H2O molecules reorientations. A phase transition was observed at 330 K. The low value of the activation energy for reorientation in the microwave frequency region is discussed. The d.c. conductivity and its temperature dependence were determined. Measurements were made in the temperature interval from 286 to 353 K. In the upper part of this temperature interval a PTCR effect was observed. (C) 2002 Published by Elsevier Science B.V.
T2  - Solid State Ionics
T1  - Dielectric relaxation and conductivity in barium salt of 12-tungstophosphoric acid hydrate
VL  - 147
IS  - 1-2
SP  - 123
EP  - 128
DO  - 10.1016/S0167-2738(02)00003-6
ER  - 

@article{
author = "Davidović, Miloš D. and Cajkovski, T and Cajkovski, D and Likar-Smiljanic, V and Biljic, R and Mioč, Ubavka B. and Nedić, Zoran",
year = "2002",
abstract = "Barium salt of 12-tungstophosphoric acid (WPA) hydrate BaHPW12O40.7H(2)O (BaHWPA-7H20) has been investigated both in the microwave (X-band) region and in the lower frequency (5 Hz-500 kHz) region. This work is a continuation of our previous investigations on the influence of monovalent and bivalent cations on the dielectric properties of WPA hydrate salts. The real and imaginary parts of the permittivity (epsilon, epsilon) as a function of frequency and temperature, were determined in both frequency regions. The observed relaxations were attributed to specific relaxation processes. In the lower frequency range, the relaxation time tau=1.0 x 10(-6) s was assigned to barium ion jumps. In the microwave region, the dielectric relaxation time tau =1.7 x 10(-11) s was attributed to polyatomic ions (H3O+) and/or H2O molecules reorientations. A phase transition was observed at 330 K. The low value of the activation energy for reorientation in the microwave frequency region is discussed. The d.c. conductivity and its temperature dependence were determined. Measurements were made in the temperature interval from 286 to 353 K. In the upper part of this temperature interval a PTCR effect was observed. (C) 2002 Published by Elsevier Science B.V.",
journal = "Solid State Ionics",
title = "Dielectric relaxation and conductivity in barium salt of 12-tungstophosphoric acid hydrate",
volume = "147",
number = "1-2",
pages = "123-128",
doi = "10.1016/S0167-2738(02)00003-6"
}

Davidović, M. D., Cajkovski, T., Cajkovski, D., Likar-Smiljanic, V., Biljic, R., Mioč, U. B.,& Nedić, Z.. (2002). Dielectric relaxation and conductivity in barium salt of 12-tungstophosphoric acid hydrate. in Solid State Ionics, 147(1-2), 123-128.
https://doi.org/10.1016/S0167-2738(02)00003-6

Davidović MD, Cajkovski T, Cajkovski D, Likar-Smiljanic V, Biljic R, Mioč UB, Nedić Z. Dielectric relaxation and conductivity in barium salt of 12-tungstophosphoric acid hydrate. in Solid State Ionics. 2002;147(1-2):123-128.
doi:10.1016/S0167-2738(02)00003-6 .

Davidović, Miloš D., Cajkovski, T, Cajkovski, D, Likar-Smiljanic, V, Biljic, R, Mioč, Ubavka B., Nedić, Zoran, "Dielectric relaxation and conductivity in barium salt of 12-tungstophosphoric acid hydrate" in Solid State Ionics, 147, no. 1-2 (2002):123-128,
https://doi.org/10.1016/S0167-2738(02)00003-6 . .

TY  - JOUR
AU  - Kremenović, Aleksandar S.
AU  - Bire, AS
AU  - Bouree, F
AU  - Colomban, P
AU  - Dimitrijevic, R
AU  - Davidović, Milorad P.
AU  - Mioč, Ubavka B.
PY  - 2002
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2550
AB  - Dodecatungstophosphoric acid hexahydrate H3PW12O40.6H(2)O crystal structure has been investigated by neutron powder diffraction (NPD) at different temperatures in the 10-358 K range. A nonconvergent reversible phase transition has been noticed at about 320 K. This transition is associated with a change in dynamic equilibrium of hydrate species and partial reduction/oxidation (redox) W6+ LT ---- GT (5+). Expressive structure changes lie in the P-O bonding inside Keggins anion and the H5O2+ conformational angle. (C) 2002 Published by Elsevier Science B.V.
T2  - Solid State Ionics
T1  - Structural modifications of dodecatungstophosphoric acid hexahydrate induced by temperature in the 10-358 K range. In situ high-resolution neutron powder diffraction investigation
VL  - 150
IS  - 3-4
SP  - 431
EP  - 442
DO  - 10.1016/S0167-2738(02)00419-8
ER  - 

@article{
author = "Kremenović, Aleksandar S. and Bire, AS and Bouree, F and Colomban, P and Dimitrijevic, R and Davidović, Milorad P. and Mioč, Ubavka B.",
year = "2002",
abstract = "Dodecatungstophosphoric acid hexahydrate H3PW12O40.6H(2)O crystal structure has been investigated by neutron powder diffraction (NPD) at different temperatures in the 10-358 K range. A nonconvergent reversible phase transition has been noticed at about 320 K. This transition is associated with a change in dynamic equilibrium of hydrate species and partial reduction/oxidation (redox) W6+ LT ---- GT (5+). Expressive structure changes lie in the P-O bonding inside Keggins anion and the H5O2+ conformational angle. (C) 2002 Published by Elsevier Science B.V.",
journal = "Solid State Ionics",
title = "Structural modifications of dodecatungstophosphoric acid hexahydrate induced by temperature in the 10-358 K range. In situ high-resolution neutron powder diffraction investigation",
volume = "150",
number = "3-4",
pages = "431-442",
doi = "10.1016/S0167-2738(02)00419-8"
}

Kremenović, A. S., Bire, A., Bouree, F., Colomban, P., Dimitrijevic, R., Davidović, M. P.,& Mioč, U. B.. (2002). Structural modifications of dodecatungstophosphoric acid hexahydrate induced by temperature in the 10-358 K range. In situ high-resolution neutron powder diffraction investigation. in Solid State Ionics, 150(3-4), 431-442.
https://doi.org/10.1016/S0167-2738(02)00419-8

Kremenović AS, Bire A, Bouree F, Colomban P, Dimitrijevic R, Davidović MP, Mioč UB. Structural modifications of dodecatungstophosphoric acid hexahydrate induced by temperature in the 10-358 K range. In situ high-resolution neutron powder diffraction investigation. in Solid State Ionics. 2002;150(3-4):431-442.
doi:10.1016/S0167-2738(02)00419-8 .

Kremenović, Aleksandar S., Bire, AS, Bouree, F, Colomban, P, Dimitrijevic, R, Davidović, Milorad P., Mioč, Ubavka B., "Structural modifications of dodecatungstophosphoric acid hexahydrate induced by temperature in the 10-358 K range. In situ high-resolution neutron powder diffraction investigation" in Solid State Ionics, 150, no. 3-4 (2002):431-442,
https://doi.org/10.1016/S0167-2738(02)00419-8 . .

TY  - JOUR
AU  - Cajkovski, T
AU  - Davidović, Milorad P.
AU  - Cajkovski, D
AU  - Likar-Smiljanic, V
AU  - Biljic, R
AU  - Mioč, Ubavka B.
AU  - Nedić, Zoran
PY  - 2000
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6312
AB  - Complex permittivity of 12-tungstophosphoric acid hexahydrate (H3PW12O40 6H(2)O), 6-WPA has been measured at microwave frequencies (X-band) in the temperature interval from 296 K to 350 K. From 296 K to 328 K 6-WPA displays dipolar relaxation of the Debye type at the frequency f(1)=9.30 GHz which corresponds to the relaxation time tau (1)=1.7x10(11) s. From 328 K to 350 K large changes of epsilon (f) and epsilon (f) take place. Two additional relaxations appear at frequencies f(2)=8.25 GHz and f(3)=10.80 GHz. These additional relaxations could be due to protonic entities that become excited at higher temperatures. An assignation of these relaxations to specific proton entities is proposed.
T2  - Materials Science Forum
T1  - Temperature dependence of dielectric relaxation in 12-tungstophosphoric acid hexahydrate at microwave frequencies
VL  - 352
SP  - 251
EP  - 254
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6312
ER  - 

@article{
author = "Cajkovski, T and Davidović, Milorad P. and Cajkovski, D and Likar-Smiljanic, V and Biljic, R and Mioč, Ubavka B. and Nedić, Zoran",
year = "2000",
abstract = "Complex permittivity of 12-tungstophosphoric acid hexahydrate (H3PW12O40 6H(2)O), 6-WPA has been measured at microwave frequencies (X-band) in the temperature interval from 296 K to 350 K. From 296 K to 328 K 6-WPA displays dipolar relaxation of the Debye type at the frequency f(1)=9.30 GHz which corresponds to the relaxation time tau (1)=1.7x10(11) s. From 328 K to 350 K large changes of epsilon (f) and epsilon (f) take place. Two additional relaxations appear at frequencies f(2)=8.25 GHz and f(3)=10.80 GHz. These additional relaxations could be due to protonic entities that become excited at higher temperatures. An assignation of these relaxations to specific proton entities is proposed.",
journal = "Materials Science Forum",
title = "Temperature dependence of dielectric relaxation in 12-tungstophosphoric acid hexahydrate at microwave frequencies",
volume = "352",
pages = "251-254",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6312"
}

Cajkovski, T., Davidović, M. P., Cajkovski, D., Likar-Smiljanic, V., Biljic, R., Mioč, U. B.,& Nedić, Z.. (2000). Temperature dependence of dielectric relaxation in 12-tungstophosphoric acid hexahydrate at microwave frequencies. in Materials Science Forum, 352, 251-254.
https://hdl.handle.net/21.15107/rcub_vinar_6312

Cajkovski T, Davidović MP, Cajkovski D, Likar-Smiljanic V, Biljic R, Mioč UB, Nedić Z. Temperature dependence of dielectric relaxation in 12-tungstophosphoric acid hexahydrate at microwave frequencies. in Materials Science Forum. 2000;352:251-254.
https://hdl.handle.net/21.15107/rcub_vinar_6312 .

Cajkovski, T, Davidović, Milorad P., Cajkovski, D, Likar-Smiljanic, V, Biljic, R, Mioč, Ubavka B., Nedić, Zoran, "Temperature dependence of dielectric relaxation in 12-tungstophosphoric acid hexahydrate at microwave frequencies" in Materials Science Forum, 352 (2000):251-254,
https://hdl.handle.net/21.15107/rcub_vinar_6312 .

TY  - JOUR
AU  - Mioč, Ubavka B.
AU  - Todorović, M
AU  - Uskoković-Marković, S
AU  - Nedić, Zoran
AU  - Stamenkovic, V
AU  - Cajkovski, T
PY  - 2000
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6292
AB  - In this paper local processes and structural phase transformations of the copper salt of 12-tungstophosphoric acid are investigated. The structural phase transformations were followed through bands, characteristic for the host lattice, in the IR and Raman spectra. The results of these investigations, as well as those of XRPD analysis and impedance measurements as a function of temperature show that some local processes provoke the change in the secondary structure of the Keggin anions.
T2  - Journal of the Serbian Chemical Society
T1  - Structural modifications of Cu(II) 12-tungstophosphoric acid salit studied by IR and Raman spectroscopy
VL  - 65
IS  - 5-6
SP  - 407
EP  - 415
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6292
ER  - 

@article{
author = "Mioč, Ubavka B. and Todorović, M and Uskoković-Marković, S and Nedić, Zoran and Stamenkovic, V and Cajkovski, T",
year = "2000",
abstract = "In this paper local processes and structural phase transformations of the copper salt of 12-tungstophosphoric acid are investigated. The structural phase transformations were followed through bands, characteristic for the host lattice, in the IR and Raman spectra. The results of these investigations, as well as those of XRPD analysis and impedance measurements as a function of temperature show that some local processes provoke the change in the secondary structure of the Keggin anions.",
journal = "Journal of the Serbian Chemical Society",
title = "Structural modifications of Cu(II) 12-tungstophosphoric acid salit studied by IR and Raman spectroscopy",
volume = "65",
number = "5-6",
pages = "407-415",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6292"
}

Mioč, U. B., Todorović, M., Uskoković-Marković, S., Nedić, Z., Stamenkovic, V.,& Cajkovski, T.. (2000). Structural modifications of Cu(II) 12-tungstophosphoric acid salit studied by IR and Raman spectroscopy. in Journal of the Serbian Chemical Society, 65(5-6), 407-415.
https://hdl.handle.net/21.15107/rcub_vinar_6292

Mioč UB, Todorović M, Uskoković-Marković S, Nedić Z, Stamenkovic V, Cajkovski T. Structural modifications of Cu(II) 12-tungstophosphoric acid salit studied by IR and Raman spectroscopy. in Journal of the Serbian Chemical Society. 2000;65(5-6):407-415.
https://hdl.handle.net/21.15107/rcub_vinar_6292 .

Mioč, Ubavka B., Todorović, M, Uskoković-Marković, S, Nedić, Zoran, Stamenkovic, V, Cajkovski, T, "Structural modifications of Cu(II) 12-tungstophosphoric acid salit studied by IR and Raman spectroscopy" in Journal of the Serbian Chemical Society, 65, no. 5-6 (2000):407-415,
https://hdl.handle.net/21.15107/rcub_vinar_6292 .

TY  - JOUR
AU  - Davidović, Miloš D.
AU  - Cajkovski, T
AU  - Cajkovski, D
AU  - Likar-Smiljanic, V
AU  - Biljic, R
AU  - Mioč, Ubavka B.
AU  - Nedić, Zoran
PY  - 1999
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6283
AB  - Magnesium salt of 12-tungstophosphoric acid (WPA) hydrate MgHPW12O40-14H(2)O has been investigated in the microwave (X-band) and in the lower frequency (5 Hz-500 kHz) region. The specimens were obtained by pressing powder. Real and imaginary parts of permittivity were obtained for the specimens in both frequency regions. In the microwave region dipolar relaxation was observed with the relaxation time tau = 1.6 X 10(-11) s. This relaxation is attributed to the fast reorientation of H2O molecules. In the lower frequency region ionic jump relaxation was observed with the relaxation time tau = 3.9 X 10(-7) s. Results on ac and dc conductivity are discussed. (C) 1999 Elsevier Science B.V. All rights reserved.
T2  - Solid State Ionics
T1  - Dielectric investigation of magnesium salt of 12-tungstophosphoric acid hydrate
VL  - 125
IS  - 1-4
SP  - 411
EP  - 415
DO  - 10.1016/S0167-2738(99)00203-9
ER  - 

@article{
author = "Davidović, Miloš D. and Cajkovski, T and Cajkovski, D and Likar-Smiljanic, V and Biljic, R and Mioč, Ubavka B. and Nedić, Zoran",
year = "1999",
abstract = "Magnesium salt of 12-tungstophosphoric acid (WPA) hydrate MgHPW12O40-14H(2)O has been investigated in the microwave (X-band) and in the lower frequency (5 Hz-500 kHz) region. The specimens were obtained by pressing powder. Real and imaginary parts of permittivity were obtained for the specimens in both frequency regions. In the microwave region dipolar relaxation was observed with the relaxation time tau = 1.6 X 10(-11) s. This relaxation is attributed to the fast reorientation of H2O molecules. In the lower frequency region ionic jump relaxation was observed with the relaxation time tau = 3.9 X 10(-7) s. Results on ac and dc conductivity are discussed. (C) 1999 Elsevier Science B.V. All rights reserved.",
journal = "Solid State Ionics",
title = "Dielectric investigation of magnesium salt of 12-tungstophosphoric acid hydrate",
volume = "125",
number = "1-4",
pages = "411-415",
doi = "10.1016/S0167-2738(99)00203-9"
}

Davidović, M. D., Cajkovski, T., Cajkovski, D., Likar-Smiljanic, V., Biljic, R., Mioč, U. B.,& Nedić, Z.. (1999). Dielectric investigation of magnesium salt of 12-tungstophosphoric acid hydrate. in Solid State Ionics, 125(1-4), 411-415.
https://doi.org/10.1016/S0167-2738(99)00203-9

Davidović MD, Cajkovski T, Cajkovski D, Likar-Smiljanic V, Biljic R, Mioč UB, Nedić Z. Dielectric investigation of magnesium salt of 12-tungstophosphoric acid hydrate. in Solid State Ionics. 1999;125(1-4):411-415.
doi:10.1016/S0167-2738(99)00203-9 .

Davidović, Miloš D., Cajkovski, T, Cajkovski, D, Likar-Smiljanic, V, Biljic, R, Mioč, Ubavka B., Nedić, Zoran, "Dielectric investigation of magnesium salt of 12-tungstophosphoric acid hydrate" in Solid State Ionics, 125, no. 1-4 (1999):411-415,
https://doi.org/10.1016/S0167-2738(99)00203-9 . .

TY  - JOUR
AU  - Mioč, Ubavka B.
AU  - Milonjić, Slobodan K.
AU  - Stamenkovic, V
AU  - Radojevic, M
AU  - Colomban, P
AU  - Mitrovic, MM
AU  - Dimitrijevic, R
PY  - 1999
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6284
AB  - Preparation of aluminosilicate gels bulk, containing 12-tungstophosphoric acid (WPA) in mesopores, as well as their structural and conduction characteristics are reported. Doped gels are prepared from aluminum-silicon alkoxide AlSi(OR)(x), iso-propanol, water and WPA . 29H(2)O mixtures. Characteristics of the obtained doped gels depend on the WPA content. Results such as WPA-filled mesopores and infra red (IR) band shifts indicate differences with respect to material obtained by mechanical alloying and interaction between the WPA and aluminosilicate host framework. According to the obtained results, especially of the higher conductivity (sigma similar to 10(-3) S/cm), WPA-doped aluminosilicate gel is a promising material for solid electrolytes. (C) 1999 Published by Elsevier Science B.V, All rights reserved.
T2  - Solid State Ionics
T1  - Structural properties and proton conductivity of the 12-tungstophosphoric acid doped aluminosilicate gels
VL  - 125
IS  - 1-4
SP  - 417
EP  - 424
DO  - 10.1016/S0167-2738(99)00204-0
ER  - 

@article{
author = "Mioč, Ubavka B. and Milonjić, Slobodan K. and Stamenkovic, V and Radojevic, M and Colomban, P and Mitrovic, MM and Dimitrijevic, R",
year = "1999",
abstract = "Preparation of aluminosilicate gels bulk, containing 12-tungstophosphoric acid (WPA) in mesopores, as well as their structural and conduction characteristics are reported. Doped gels are prepared from aluminum-silicon alkoxide AlSi(OR)(x), iso-propanol, water and WPA . 29H(2)O mixtures. Characteristics of the obtained doped gels depend on the WPA content. Results such as WPA-filled mesopores and infra red (IR) band shifts indicate differences with respect to material obtained by mechanical alloying and interaction between the WPA and aluminosilicate host framework. According to the obtained results, especially of the higher conductivity (sigma similar to 10(-3) S/cm), WPA-doped aluminosilicate gel is a promising material for solid electrolytes. (C) 1999 Published by Elsevier Science B.V, All rights reserved.",
journal = "Solid State Ionics",
title = "Structural properties and proton conductivity of the 12-tungstophosphoric acid doped aluminosilicate gels",
volume = "125",
number = "1-4",
pages = "417-424",
doi = "10.1016/S0167-2738(99)00204-0"
}

Mioč, U. B., Milonjić, S. K., Stamenkovic, V., Radojevic, M., Colomban, P., Mitrovic, M.,& Dimitrijevic, R.. (1999). Structural properties and proton conductivity of the 12-tungstophosphoric acid doped aluminosilicate gels. in Solid State Ionics, 125(1-4), 417-424.
https://doi.org/10.1016/S0167-2738(99)00204-0

Mioč UB, Milonjić SK, Stamenkovic V, Radojevic M, Colomban P, Mitrovic M, Dimitrijevic R. Structural properties and proton conductivity of the 12-tungstophosphoric acid doped aluminosilicate gels. in Solid State Ionics. 1999;125(1-4):417-424.
doi:10.1016/S0167-2738(99)00204-0 .

Mioč, Ubavka B., Milonjić, Slobodan K., Stamenkovic, V, Radojevic, M, Colomban, P, Mitrovic, MM, Dimitrijevic, R, "Structural properties and proton conductivity of the 12-tungstophosphoric acid doped aluminosilicate gels" in Solid State Ionics, 125, no. 1-4 (1999):417-424,
https://doi.org/10.1016/S0167-2738(99)00204-0 . .

TY  - JOUR
AU  - Čajkovski, Tamara
AU  - Davidović, Milorad P.
AU  - Čajkovski, D.
AU  - Likar-Smiljanić, Vladana D.
AU  - Biljić, Radivoje M.
AU  - Mioč, Ubavka B.
AU  - Stamenković, Vojislav R.
PY  - 1998
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2180
AB  - Heteropolyacids hydrates as superionic conductors have been intensely investigated during the last fifteen years. By using various experimental techniques such as IR and Raman spectroscopy, neutron scattering, impedance measurements, X-ray diffraction and others, informations have been obtained on the properties of protonic entities and conductivity mechanisms. The salts of heteropolyacids have been less investigated although there is a steady growth of activities in this field too. In this work the results of permittivity measurements are presented on copper and calcium salts of 12-tungstophosphoric acid hydrates (CuHPW12O40. 15H(2)O and CaHPW12O40. 13H(2)O). Measurements have been done in the region of microwaves, at room temperature and in a room ambient. The aim of this work was to study the influence of copper and calcium ions on dielectric relaxation processes in these salts. Dielectric relaxations have been found for both salts. Contributions of fast reorientations of H2O molecules and oxonium ions (H3O+) to these relaxations are discussed as well as, their influence on dynamic conductivity.
T2  - Solid State Phenomena
T1  - Dielectric properties of metal salts of heteropolyacid hydrates
VL  - 61-2
SP  - 279
EP  - 283
DO  - 10.4028/www.scientific.net/ssp.61-62.279
UR  - https://hdl.handle.net/21.15107/rcub_vinar_2180
ER  - 

@article{
author = "Čajkovski, Tamara and Davidović, Milorad P. and Čajkovski, D. and Likar-Smiljanić, Vladana D. and Biljić, Radivoje M. and Mioč, Ubavka B. and Stamenković, Vojislav R.",
year = "1998",
abstract = "Heteropolyacids hydrates as superionic conductors have been intensely investigated during the last fifteen years. By using various experimental techniques such as IR and Raman spectroscopy, neutron scattering, impedance measurements, X-ray diffraction and others, informations have been obtained on the properties of protonic entities and conductivity mechanisms. The salts of heteropolyacids have been less investigated although there is a steady growth of activities in this field too. In this work the results of permittivity measurements are presented on copper and calcium salts of 12-tungstophosphoric acid hydrates (CuHPW12O40. 15H(2)O and CaHPW12O40. 13H(2)O). Measurements have been done in the region of microwaves, at room temperature and in a room ambient. The aim of this work was to study the influence of copper and calcium ions on dielectric relaxation processes in these salts. Dielectric relaxations have been found for both salts. Contributions of fast reorientations of H2O molecules and oxonium ions (H3O+) to these relaxations are discussed as well as, their influence on dynamic conductivity.",
journal = "Solid State Phenomena",
title = "Dielectric properties of metal salts of heteropolyacid hydrates",
volume = "61-2",
pages = "279-283",
doi = "10.4028/www.scientific.net/ssp.61-62.279",
url = "https://hdl.handle.net/21.15107/rcub_vinar_2180"
}

Čajkovski, T., Davidović, M. P., Čajkovski, D., Likar-Smiljanić, V. D., Biljić, R. M., Mioč, U. B.,& Stamenković, V. R.. (1998). Dielectric properties of metal salts of heteropolyacid hydrates. in Solid State Phenomena, 61-2, 279-283.
https://doi.org/10.4028/www.scientific.net/ssp.61-62.279
https://hdl.handle.net/21.15107/rcub_vinar_2180

Čajkovski T, Davidović MP, Čajkovski D, Likar-Smiljanić VD, Biljić RM, Mioč UB, Stamenković VR. Dielectric properties of metal salts of heteropolyacid hydrates. in Solid State Phenomena. 1998;61-2:279-283.
doi:10.4028/www.scientific.net/ssp.61-62.279
https://hdl.handle.net/21.15107/rcub_vinar_2180 .

Čajkovski, Tamara, Davidović, Milorad P., Čajkovski, D., Likar-Smiljanić, Vladana D., Biljić, Radivoje M., Mioč, Ubavka B., Stamenković, Vojislav R., "Dielectric properties of metal salts of heteropolyacid hydrates" in Solid State Phenomena, 61-2 (1998):279-283,
https://doi.org/10.4028/www.scientific.net/ssp.61-62.279 .,
https://hdl.handle.net/21.15107/rcub_vinar_2180 .

TY  - JOUR
AU  - Cajkovski, T
AU  - Davidović, Milorad P.
AU  - Cajkovski, D
AU  - Likar-Smiljanic, V
AU  - Biljic, R
AU  - Mioč, Ubavka B.
AU  - Nedić, Zoran
PY  - 1998
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6251
AB  - Complex permittivity measurements have been performed on lithium and cesium salts of 12-tungstophosphoric acid hydrates (H3PW12O40.nH(2)O) within the frequency region of the microwave X-band (8 - 12 GHz) and at room temperature. Dielectric relaxation spectra have been observed for both salts. For the lithium salt (Li3PW12O40.11H(2)O) one dipolar relaxation has been recorded, whereas for the cesium salt (CS3PW12O40.10H(2)O) two dipolar relaxations have been registered. The results are discussed by assuming that the fast reorientation of H2O molecules and oxonium ions (H3O+) contribute to the observed relaxations. Dynamical conductivity results exhibit frequency dependence with a waviness reflecting the observed dipolar relaxations.
T2  - Materials Science Forum
T1  - X-band microwave permittivity measurements on lithium and cesium salts of 12-tunstophosphoric acid
VL  - 282-2
SP  - 193
EP  - 197
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6251
ER  - 

@article{
author = "Cajkovski, T and Davidović, Milorad P. and Cajkovski, D and Likar-Smiljanic, V and Biljic, R and Mioč, Ubavka B. and Nedić, Zoran",
year = "1998",
abstract = "Complex permittivity measurements have been performed on lithium and cesium salts of 12-tungstophosphoric acid hydrates (H3PW12O40.nH(2)O) within the frequency region of the microwave X-band (8 - 12 GHz) and at room temperature. Dielectric relaxation spectra have been observed for both salts. For the lithium salt (Li3PW12O40.11H(2)O) one dipolar relaxation has been recorded, whereas for the cesium salt (CS3PW12O40.10H(2)O) two dipolar relaxations have been registered. The results are discussed by assuming that the fast reorientation of H2O molecules and oxonium ions (H3O+) contribute to the observed relaxations. Dynamical conductivity results exhibit frequency dependence with a waviness reflecting the observed dipolar relaxations.",
journal = "Materials Science Forum",
title = "X-band microwave permittivity measurements on lithium and cesium salts of 12-tunstophosphoric acid",
volume = "282-2",
pages = "193-197",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6251"
}

Cajkovski, T., Davidović, M. P., Cajkovski, D., Likar-Smiljanic, V., Biljic, R., Mioč, U. B.,& Nedić, Z.. (1998). X-band microwave permittivity measurements on lithium and cesium salts of 12-tunstophosphoric acid. in Materials Science Forum, 282-2, 193-197.
https://hdl.handle.net/21.15107/rcub_vinar_6251

Cajkovski T, Davidović MP, Cajkovski D, Likar-Smiljanic V, Biljic R, Mioč UB, Nedić Z. X-band microwave permittivity measurements on lithium and cesium salts of 12-tunstophosphoric acid. in Materials Science Forum. 1998;282-2:193-197.
https://hdl.handle.net/21.15107/rcub_vinar_6251 .

Cajkovski, T, Davidović, Milorad P., Cajkovski, D, Likar-Smiljanic, V, Biljic, R, Mioč, Ubavka B., Nedić, Zoran, "X-band microwave permittivity measurements on lithium and cesium salts of 12-tunstophosphoric acid" in Materials Science Forum, 282-2 (1998):193-197,
https://hdl.handle.net/21.15107/rcub_vinar_6251 .