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  - Bošković, Snežana B.
AU  - Kosanovic, D
AU  - Dondur, Vera
AU  - Dimitrijevic, R
PY  - 2000
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2298
AB  - The synthesis of Si3N4-celsian composite materials was studied in this paper. To obtain celsian, two different types of additives were used. In the first case the appropriate mixture of BaCO3, Al2O3 and SiO2 was added to Si3N4, while in the second case a Ba-A-zeolite, previously heated at 850 degrees C, was used as an additive. Mixtures of Si3N4 and the sintering aids were homogenized in a vibratory mill in the presence of isopropanol. The green bodies were pressurelessly sintered in nitrogen atmosphere at temperatures of 1650-1750 degrees C. Densification degree was followed, as well as microstructural changes, as a function of the sintering conditions and the additive used. Reaction of BAS formation was followed by X-ray analysis during the heating up period. It was found that with 10% zeolite as a sintering aid, full densification was achieved at 1750 degrees C but with the same amount of oxide mixture, only 96% TD was attained. Phase changes were followed also during cooling down the samples from sintering temperature. Two crystalline phases, beta-Si3N4 and hexacelsian, were present in both types of sintered samples. (C) 1999 Elsevier Science Ltd and Techna S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Synthesis of Si3N4-celsian composite materials
VL  - 26
IS  - 1
SP  - 33
EP  - 37
DO  - 10.1016/S0272-8842(99)00016-4
ER  - 

@article{
author = "Bošković, Snežana B. and Kosanovic, D and Dondur, Vera and Dimitrijevic, R",
year = "2000",
abstract = "The synthesis of Si3N4-celsian composite materials was studied in this paper. To obtain celsian, two different types of additives were used. In the first case the appropriate mixture of BaCO3, Al2O3 and SiO2 was added to Si3N4, while in the second case a Ba-A-zeolite, previously heated at 850 degrees C, was used as an additive. Mixtures of Si3N4 and the sintering aids were homogenized in a vibratory mill in the presence of isopropanol. The green bodies were pressurelessly sintered in nitrogen atmosphere at temperatures of 1650-1750 degrees C. Densification degree was followed, as well as microstructural changes, as a function of the sintering conditions and the additive used. Reaction of BAS formation was followed by X-ray analysis during the heating up period. It was found that with 10% zeolite as a sintering aid, full densification was achieved at 1750 degrees C but with the same amount of oxide mixture, only 96% TD was attained. Phase changes were followed also during cooling down the samples from sintering temperature. Two crystalline phases, beta-Si3N4 and hexacelsian, were present in both types of sintered samples. (C) 1999 Elsevier Science Ltd and Techna S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Synthesis of Si3N4-celsian composite materials",
volume = "26",
number = "1",
pages = "33-37",
doi = "10.1016/S0272-8842(99)00016-4"
}

Bošković, S. B., Kosanovic, D., Dondur, V.,& Dimitrijevic, R.. (2000). Synthesis of Si3N4-celsian composite materials. in Ceramics International, 26(1), 33-37.
https://doi.org/10.1016/S0272-8842(99)00016-4

Bošković SB, Kosanovic D, Dondur V, Dimitrijevic R. Synthesis of Si3N4-celsian composite materials. in Ceramics International. 2000;26(1):33-37.
doi:10.1016/S0272-8842(99)00016-4 .

Bošković, Snežana B., Kosanovic, D, Dondur, Vera, Dimitrijevic, R, "Synthesis of Si3N4-celsian composite materials" in Ceramics International, 26, no. 1 (2000):33-37,
https://doi.org/10.1016/S0272-8842(99)00016-4 . .

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  - Mitrić, Miodrag
AU  - Kremenović, Aleksandar S.
AU  - Dimitrijevic, R
AU  - Rodić, Dubravko
PY  - 1997
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6227
AB  - SmxY2-xO3 solid solutions are semimagnetic semiconducting materials with wide energy gaps. Magnetic properties of these materials are coupled with their structural and microstructural parameters. Evidently, it is of interest to investigate these parameters in order to explain magnetic properties of diluted magnets. All mixed sesquioxides SmxY2-xO3 (x = 0.2, 0.5, 0.7, 1.0, 1.4 and 1.7) crystallize in C-M2O3 crystal type in space group Ia3 with Y3+ and Sm3+ cations in 24(d) and 8(b) Wyckoff positions, respectively. The X-ray diffraction data were used to establish the distribution of magnetic ions over crystallographic positions 8(b) and 24(d). A random distribution was found. The same data were used for evaluation of the crystal size, microstrain and paracrystallinity. The concentration dependence of these values was concluded. Results show that unit cell parameters obey Vegards rule, That fact leads to indirect information about well mixing of Y2O3 and Sm2O3. Agreement of the unit cell parameters with Vegards rule is connected with the difference between cationic radii and electronegativity, The Sm3+-O2--Sm3+ bond geometry, important for the superexchange interaction, strongly depends on Sm3+ concentration. By comparing difference of unit cell parameters of the constitutive components Y2O3 and Sm2O3 and values of microstrains of their solid solutions it can be concluded that clusters are randomly formed.
T2  - Solid State Ionics
T1  - Structure and microstructure of SmxY2-xO3
VL  - 101
SP  - 495
EP  - 501
DO  - 10.1016/S0167-2738(97)00150-1
ER  - 

@article{
author = "Mitrić, Miodrag and Kremenović, Aleksandar S. and Dimitrijevic, R and Rodić, Dubravko",
year = "1997",
abstract = "SmxY2-xO3 solid solutions are semimagnetic semiconducting materials with wide energy gaps. Magnetic properties of these materials are coupled with their structural and microstructural parameters. Evidently, it is of interest to investigate these parameters in order to explain magnetic properties of diluted magnets. All mixed sesquioxides SmxY2-xO3 (x = 0.2, 0.5, 0.7, 1.0, 1.4 and 1.7) crystallize in C-M2O3 crystal type in space group Ia3 with Y3+ and Sm3+ cations in 24(d) and 8(b) Wyckoff positions, respectively. The X-ray diffraction data were used to establish the distribution of magnetic ions over crystallographic positions 8(b) and 24(d). A random distribution was found. The same data were used for evaluation of the crystal size, microstrain and paracrystallinity. The concentration dependence of these values was concluded. Results show that unit cell parameters obey Vegards rule, That fact leads to indirect information about well mixing of Y2O3 and Sm2O3. Agreement of the unit cell parameters with Vegards rule is connected with the difference between cationic radii and electronegativity, The Sm3+-O2--Sm3+ bond geometry, important for the superexchange interaction, strongly depends on Sm3+ concentration. By comparing difference of unit cell parameters of the constitutive components Y2O3 and Sm2O3 and values of microstrains of their solid solutions it can be concluded that clusters are randomly formed.",
journal = "Solid State Ionics",
title = "Structure and microstructure of SmxY2-xO3",
volume = "101",
pages = "495-501",
doi = "10.1016/S0167-2738(97)00150-1"
}

Mitrić, M., Kremenović, A. S., Dimitrijevic, R.,& Rodić, D.. (1997). Structure and microstructure of SmxY2-xO3. in Solid State Ionics, 101, 495-501.
https://doi.org/10.1016/S0167-2738(97)00150-1

Mitrić M, Kremenović AS, Dimitrijevic R, Rodić D. Structure and microstructure of SmxY2-xO3. in Solid State Ionics. 1997;101:495-501.
doi:10.1016/S0167-2738(97)00150-1 .

Mitrić, Miodrag, Kremenović, Aleksandar S., Dimitrijevic, R, Rodić, Dubravko, "Structure and microstructure of SmxY2-xO3" in Solid State Ionics, 101 (1997):495-501,
https://doi.org/10.1016/S0167-2738(97)00150-1 . .

TY  - JOUR
AU  - Mioč, Ubavka B.
AU  - Milonjić, Slobodan K.
AU  - Malović, D
AU  - Stamenkovic, V
AU  - Colomban, P
AU  - Mitrovic, MM
AU  - Dimitrijevic, R
PY  - 1997
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7235
AB  - Sol-gel syntheses offer a wide range of possibilities for introduction of materials with specific properties (electronic, optic and ion-conductive, etc.) into optically clear matrices. Preparation of silica gel bulk, containing 12-tungstophosphoric acid (WPA) in mesopores, as well as its structural and conduction characteristics are reported. Characteristics of the obtained doped gels depend on the gel preparation, gelation process and the WPA content. According to the obtained results, especially for the high conductivity (sigma similar to 0.1 S/cm), WPA doped silica gel is a promising material for solid electrolytes.
T2  - Solid State Ionics
T1  - Structure and proton conductivity of 12-tungstophosphoric acid doped silica
VL  - 97
IS  - 1-4
SP  - 239
EP  - 246
DO  - 10.1016/S0167-2738(97)00089-1
ER  - 

@article{
author = "Mioč, Ubavka B. and Milonjić, Slobodan K. and Malović, D and Stamenkovic, V and Colomban, P and Mitrovic, MM and Dimitrijevic, R",
year = "1997",
abstract = "Sol-gel syntheses offer a wide range of possibilities for introduction of materials with specific properties (electronic, optic and ion-conductive, etc.) into optically clear matrices. Preparation of silica gel bulk, containing 12-tungstophosphoric acid (WPA) in mesopores, as well as its structural and conduction characteristics are reported. Characteristics of the obtained doped gels depend on the gel preparation, gelation process and the WPA content. According to the obtained results, especially for the high conductivity (sigma similar to 0.1 S/cm), WPA doped silica gel is a promising material for solid electrolytes.",
journal = "Solid State Ionics",
title = "Structure and proton conductivity of 12-tungstophosphoric acid doped silica",
volume = "97",
number = "1-4",
pages = "239-246",
doi = "10.1016/S0167-2738(97)00089-1"
}

Mioč, U. B., Milonjić, S. K., Malović, D., Stamenkovic, V., Colomban, P., Mitrovic, M.,& Dimitrijevic, R.. (1997). Structure and proton conductivity of 12-tungstophosphoric acid doped silica. in Solid State Ionics, 97(1-4), 239-246.
https://doi.org/10.1016/S0167-2738(97)00089-1

Mioč UB, Milonjić SK, Malović D, Stamenkovic V, Colomban P, Mitrovic M, Dimitrijevic R. Structure and proton conductivity of 12-tungstophosphoric acid doped silica. in Solid State Ionics. 1997;97(1-4):239-246.
doi:10.1016/S0167-2738(97)00089-1 .

Mioč, Ubavka B., Milonjić, Slobodan K., Malović, D, Stamenkovic, V, Colomban, P, Mitrovic, MM, Dimitrijevic, R, "Structure and proton conductivity of 12-tungstophosphoric acid doped silica" in Solid State Ionics, 97, no. 1-4 (1997):239-246,
https://doi.org/10.1016/S0167-2738(97)00089-1 . .