TY  - JOUR
AU  - Radisavljević, Ivana
AU  - Novaković, Nikola
AU  - Mahnke, Heinz-Eberhard
AU  - Romčević, Nebojša Ž.
AU  - Mitrić, Miodrag
AU  - Kuzmanović, Bojana
AU  - Ivanović, Nenad
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10268
AB  - As an extension of our previous studies of multi-component semiconductors doped with magnetic impurities, this paper gives a comprehensive insight into electronic and local structure of crystalline semiconductors Cd0.98Co0.02Se, Cd0.98Co0.02Se0.9S0.1, and Cd0.98Co0.02Se0.9Te0.1. Detailed characterization of Co and Se local environment and overall influence of Co and S(Te) (co)doping on the host crystal structure has been obtained by X-ray absorption fine structure (XAFS) technique and electronic structure calculations. Important structural information on bond lengths and disorder parameters were extracted from the extended region of the absorption spectra, while the relationships between electronic and local structures were determined from the characteristic features appearing in the near-edge spectral region. The influence of various structural defects on local electronic properties, charge transfer and atomic interactions has been studied by theoretical modeling of XAFS spectra and calculations of local density of electronic states. The obtained findings offer possible means for improvement and extension of the practical application of CdSe-based materials by adjusting the details of their electronic structure.
T2  - Journal of the Physical Society of Japan
T1  - Survey of Electronic and Local Structural Properties of Cd1−xCoxSe1−yTe(S)y by XAFS
VL  - 91
IS  - 5
SP  - 054801
DO  - 10.7566/JPSJ.91.054801
ER  - 

@article{
author = "Radisavljević, Ivana and Novaković, Nikola and Mahnke, Heinz-Eberhard and Romčević, Nebojša Ž. and Mitrić, Miodrag and Kuzmanović, Bojana and Ivanović, Nenad",
year = "2022",
abstract = "As an extension of our previous studies of multi-component semiconductors doped with magnetic impurities, this paper gives a comprehensive insight into electronic and local structure of crystalline semiconductors Cd0.98Co0.02Se, Cd0.98Co0.02Se0.9S0.1, and Cd0.98Co0.02Se0.9Te0.1. Detailed characterization of Co and Se local environment and overall influence of Co and S(Te) (co)doping on the host crystal structure has been obtained by X-ray absorption fine structure (XAFS) technique and electronic structure calculations. Important structural information on bond lengths and disorder parameters were extracted from the extended region of the absorption spectra, while the relationships between electronic and local structures were determined from the characteristic features appearing in the near-edge spectral region. The influence of various structural defects on local electronic properties, charge transfer and atomic interactions has been studied by theoretical modeling of XAFS spectra and calculations of local density of electronic states. The obtained findings offer possible means for improvement and extension of the practical application of CdSe-based materials by adjusting the details of their electronic structure.",
journal = "Journal of the Physical Society of Japan",
title = "Survey of Electronic and Local Structural Properties of Cd1−xCoxSe1−yTe(S)y by XAFS",
volume = "91",
number = "5",
pages = "054801",
doi = "10.7566/JPSJ.91.054801"
}

Radisavljević, I., Novaković, N., Mahnke, H., Romčević, N. Ž., Mitrić, M., Kuzmanović, B.,& Ivanović, N.. (2022). Survey of Electronic and Local Structural Properties of Cd1−xCoxSe1−yTe(S)y by XAFS. in Journal of the Physical Society of Japan, 91(5), 054801.
https://doi.org/10.7566/JPSJ.91.054801

Radisavljević I, Novaković N, Mahnke H, Romčević NŽ, Mitrić M, Kuzmanović B, Ivanović N. Survey of Electronic and Local Structural Properties of Cd1−xCoxSe1−yTe(S)y by XAFS. in Journal of the Physical Society of Japan. 2022;91(5):054801.
doi:10.7566/JPSJ.91.054801 .

Radisavljević, Ivana, Novaković, Nikola, Mahnke, Heinz-Eberhard, Romčević, Nebojša Ž., Mitrić, Miodrag, Kuzmanović, Bojana, Ivanović, Nenad, "Survey of Electronic and Local Structural Properties of Cd1−xCoxSe1−yTe(S)y by XAFS" in Journal of the Physical Society of Japan, 91, no. 5 (2022):054801,
https://doi.org/10.7566/JPSJ.91.054801 . .

TY  - JOUR
AU  - Radisavljević, Ivana
AU  - Novaković, Nikola
AU  - Mahnke, Heinz-Eberhard
AU  - Andrić, Velibor
AU  - Kurko, Sandra V.
AU  - Milivojević, Dušan
AU  - Romčević, Nebojša Ž.
AU  - Ivanović, Nenad
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8004
AB  - Paper presents detailed studies of local and electronic structure around Fe in Cd0.97Fe0.03Te, Cd0.98Fe0.02Te0.97Se0.03 and Cd0.99Fe0.01Te0.91S0.09 multinary chalcogenides by means of X–ray absorption fine structure (XAFS), X–ray magnetic circular dichroism (XMCD) and electron paramagnetic resonance (EPR) measurements. In addition, electronic consequences of Fe incorporation into CdTe semiconductor host were studied by means of first principles calculations. In order to improve accuracy of the calculated total energies, the band gaps and the band edge positions, special attention is paid to the treatment of exchange–correlation interaction and the description of highly localized Fe 3d–states. Also, the Bader theory of the topological properties of the electron charge density is used to access details of the nature, strength and distribution of the (next) nearest neighbour bonds. Local and electronic structure around Fe in Cd0.97Fe0.03Te and Cd0.98Fe0.02Te0.97Se0.03 systems have been found to exhibit similar characteristics, since the first coordination sphere around Fe comprises four Te atoms located at approximately the same distance. In Cd0.99Fe0.01Te0.91S0.09 system, however, local bimodal distribution of distances has been revealed, with one Fe–Te bond replaced with much shorter Fe–S bond, resulting in much stronger crystal–field. Along with the crystal field effect, the spin–orbit interaction has proven to play decisive role in determining the nature of Fe doped CdTe systems. While the systems with higher Fe concentrations (25 at.%) are intrinsic insulators, in systems with only 3.125 at.% Fe one spin channel contributes to the density of states at the Fermi level, which makes them suitable for spin selective electronic transport applications. © 2018 Elsevier B.V.
T2  - Journal of Alloys and Compounds
T1  - Survey of electronic properties and local structures around Fe in selected multinary chalcogenides
VL  - 782
SP  - 160
EP  - 169
DO  - 10.1016/j.jallcom.2018.12.167
ER  - 

@article{
author = "Radisavljević, Ivana and Novaković, Nikola and Mahnke, Heinz-Eberhard and Andrić, Velibor and Kurko, Sandra V. and Milivojević, Dušan and Romčević, Nebojša Ž. and Ivanović, Nenad",
year = "2019",
abstract = "Paper presents detailed studies of local and electronic structure around Fe in Cd0.97Fe0.03Te, Cd0.98Fe0.02Te0.97Se0.03 and Cd0.99Fe0.01Te0.91S0.09 multinary chalcogenides by means of X–ray absorption fine structure (XAFS), X–ray magnetic circular dichroism (XMCD) and electron paramagnetic resonance (EPR) measurements. In addition, electronic consequences of Fe incorporation into CdTe semiconductor host were studied by means of first principles calculations. In order to improve accuracy of the calculated total energies, the band gaps and the band edge positions, special attention is paid to the treatment of exchange–correlation interaction and the description of highly localized Fe 3d–states. Also, the Bader theory of the topological properties of the electron charge density is used to access details of the nature, strength and distribution of the (next) nearest neighbour bonds. Local and electronic structure around Fe in Cd0.97Fe0.03Te and Cd0.98Fe0.02Te0.97Se0.03 systems have been found to exhibit similar characteristics, since the first coordination sphere around Fe comprises four Te atoms located at approximately the same distance. In Cd0.99Fe0.01Te0.91S0.09 system, however, local bimodal distribution of distances has been revealed, with one Fe–Te bond replaced with much shorter Fe–S bond, resulting in much stronger crystal–field. Along with the crystal field effect, the spin–orbit interaction has proven to play decisive role in determining the nature of Fe doped CdTe systems. While the systems with higher Fe concentrations (25 at.%) are intrinsic insulators, in systems with only 3.125 at.% Fe one spin channel contributes to the density of states at the Fermi level, which makes them suitable for spin selective electronic transport applications. © 2018 Elsevier B.V.",
journal = "Journal of Alloys and Compounds",
title = "Survey of electronic properties and local structures around Fe in selected multinary chalcogenides",
volume = "782",
pages = "160-169",
doi = "10.1016/j.jallcom.2018.12.167"
}

Radisavljević, I., Novaković, N., Mahnke, H., Andrić, V., Kurko, S. V., Milivojević, D., Romčević, N. Ž.,& Ivanović, N.. (2019). Survey of electronic properties and local structures around Fe in selected multinary chalcogenides. in Journal of Alloys and Compounds, 782, 160-169.
https://doi.org/10.1016/j.jallcom.2018.12.167

Radisavljević I, Novaković N, Mahnke H, Andrić V, Kurko SV, Milivojević D, Romčević NŽ, Ivanović N. Survey of electronic properties and local structures around Fe in selected multinary chalcogenides. in Journal of Alloys and Compounds. 2019;782:160-169.
doi:10.1016/j.jallcom.2018.12.167 .

Radisavljević, Ivana, Novaković, Nikola, Mahnke, Heinz-Eberhard, Andrić, Velibor, Kurko, Sandra V., Milivojević, Dušan, Romčević, Nebojša Ž., Ivanović, Nenad, "Survey of electronic properties and local structures around Fe in selected multinary chalcogenides" in Journal of Alloys and Compounds, 782 (2019):160-169,
https://doi.org/10.1016/j.jallcom.2018.12.167 . .

TY  - JOUR
AU  - Koteski, Vasil J.
AU  - Ivanovski, Valentin N.
AU  - Umićević, Ana
AU  - Belošević-Čavor, Jelena
AU  - Toprek, Dragan
AU  - Mahnke, Heinz-Eberhard
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1688
AB  - Magnetic ground states, local crystallographic environment of Fe, and hyperfine interaction parameters in tetragonal FeX (X = S, Se, Te) are investigated by means of density functional theory (DFT) calculations using augmented plane waves plus local orbitals (APW + lo) method. We use several different magnetic configurations to evaluate the magnetic and electronic properties of this system, as well as the hyperfine interaction parameters at Fe lattice site. The results obtained for the ground state collinear anti-ferromagnetic arrangement relatively well reproduce the quadrupole splitting and isomer shifts from the available Mossbauer measurements. The Baders atoms in molecule charge density analysis indicates bonding of closed-shell type and a sizable charge transfer from Fe to X. The system properties are sensitive to the structural optimization of the position of the chalcogen atom with respect to the iron plane. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Journal of Magnetism and Magnetic Materials
T1  - First-principles calculations of tetragonal FeX (X = S, Se, Te): Magnetism, hyperfine-interaction, and bonding
VL  - 441
SP  - 769
EP  - 775
DO  - 10.1016/j.jmmm.2017.06.092
ER  - 

@article{
author = "Koteski, Vasil J. and Ivanovski, Valentin N. and Umićević, Ana and Belošević-Čavor, Jelena and Toprek, Dragan and Mahnke, Heinz-Eberhard",
year = "2017",
abstract = "Magnetic ground states, local crystallographic environment of Fe, and hyperfine interaction parameters in tetragonal FeX (X = S, Se, Te) are investigated by means of density functional theory (DFT) calculations using augmented plane waves plus local orbitals (APW + lo) method. We use several different magnetic configurations to evaluate the magnetic and electronic properties of this system, as well as the hyperfine interaction parameters at Fe lattice site. The results obtained for the ground state collinear anti-ferromagnetic arrangement relatively well reproduce the quadrupole splitting and isomer shifts from the available Mossbauer measurements. The Baders atoms in molecule charge density analysis indicates bonding of closed-shell type and a sizable charge transfer from Fe to X. The system properties are sensitive to the structural optimization of the position of the chalcogen atom with respect to the iron plane. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Journal of Magnetism and Magnetic Materials",
title = "First-principles calculations of tetragonal FeX (X = S, Se, Te): Magnetism, hyperfine-interaction, and bonding",
volume = "441",
pages = "769-775",
doi = "10.1016/j.jmmm.2017.06.092"
}

Koteski, V. J., Ivanovski, V. N., Umićević, A., Belošević-Čavor, J., Toprek, D.,& Mahnke, H.. (2017). First-principles calculations of tetragonal FeX (X = S, Se, Te): Magnetism, hyperfine-interaction, and bonding. in Journal of Magnetism and Magnetic Materials, 441, 769-775.
https://doi.org/10.1016/j.jmmm.2017.06.092

Koteski VJ, Ivanovski VN, Umićević A, Belošević-Čavor J, Toprek D, Mahnke H. First-principles calculations of tetragonal FeX (X = S, Se, Te): Magnetism, hyperfine-interaction, and bonding. in Journal of Magnetism and Magnetic Materials. 2017;441:769-775.
doi:10.1016/j.jmmm.2017.06.092 .

Koteski, Vasil J., Ivanovski, Valentin N., Umićević, Ana, Belošević-Čavor, Jelena, Toprek, Dragan, Mahnke, Heinz-Eberhard, "First-principles calculations of tetragonal FeX (X = S, Se, Te): Magnetism, hyperfine-interaction, and bonding" in Journal of Magnetism and Magnetic Materials, 441 (2017):769-775,
https://doi.org/10.1016/j.jmmm.2017.06.092 . .

TY  - JOUR
AU  - Radisavljević, Ivana
AU  - Kuzmanović, Bojana
AU  - Novaković, Nikola
AU  - Mahnke, Heinz-Eberhard
AU  - Vulićević, Lj.
AU  - Kurko, Sandra V.
AU  - Ivanović, Nenad
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1383
AB  - Structural and electronic properties, oxidation and aging effect of electrochemically (EC) synthesized magnetite nanopowders (NPs) are studied by means of X-ray diffraction (XRD), X-ray absorption fine structure (XAFS) and X-ray magnetic circular dichroism (XMCD). The obtained results enabled to get a direct insight into the structure and electronic properties of Fe immediate surrounding and to elucidate the influence of preparation conditions on stoichiometry of NPs and their stability in ambient conditions. All investigated NPs are produced as nonestoichiometric Fe3-delta O4 oxide phases, with the lattice constant and the Fe2+/Fe3+ ratio both in-between the values for bulk maghemite and magnetite. NPs synthesized under smaller current density (J = 200 mA/dm(2)) are more magnetite-alike, whereas larger current density (J = 1000 mA/dm(2)) has led to formation of NPs closer to maghemite. Oxidation of magnetite-like NPs is slower, although in the course of time particles agglomerate and oxide penetrates into the core. Maghemite-like NPs oxidize much faster and the oxide layer which is confined close to the particles surface protects the core from further oxidation. In all NPs the fist coordination around Fe is pretty stable against both temperature and oxidation process. The temperature change from 293 K to 20 K considerably affects the second coordination around Fe, which is most likely a consequence of the Verwey transition present in all investigated samples. (C) 2016 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Structural stability and local electronic properties of some EC synthesized magnetite nanopowders
VL  - 697
SP  - 409
EP  - 416
DO  - 10.1016/j.jallcom.2016.11.090
ER  - 

@article{
author = "Radisavljević, Ivana and Kuzmanović, Bojana and Novaković, Nikola and Mahnke, Heinz-Eberhard and Vulićević, Lj. and Kurko, Sandra V. and Ivanović, Nenad",
year = "2017",
abstract = "Structural and electronic properties, oxidation and aging effect of electrochemically (EC) synthesized magnetite nanopowders (NPs) are studied by means of X-ray diffraction (XRD), X-ray absorption fine structure (XAFS) and X-ray magnetic circular dichroism (XMCD). The obtained results enabled to get a direct insight into the structure and electronic properties of Fe immediate surrounding and to elucidate the influence of preparation conditions on stoichiometry of NPs and their stability in ambient conditions. All investigated NPs are produced as nonestoichiometric Fe3-delta O4 oxide phases, with the lattice constant and the Fe2+/Fe3+ ratio both in-between the values for bulk maghemite and magnetite. NPs synthesized under smaller current density (J = 200 mA/dm(2)) are more magnetite-alike, whereas larger current density (J = 1000 mA/dm(2)) has led to formation of NPs closer to maghemite. Oxidation of magnetite-like NPs is slower, although in the course of time particles agglomerate and oxide penetrates into the core. Maghemite-like NPs oxidize much faster and the oxide layer which is confined close to the particles surface protects the core from further oxidation. In all NPs the fist coordination around Fe is pretty stable against both temperature and oxidation process. The temperature change from 293 K to 20 K considerably affects the second coordination around Fe, which is most likely a consequence of the Verwey transition present in all investigated samples. (C) 2016 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Structural stability and local electronic properties of some EC synthesized magnetite nanopowders",
volume = "697",
pages = "409-416",
doi = "10.1016/j.jallcom.2016.11.090"
}

Radisavljević, I., Kuzmanović, B., Novaković, N., Mahnke, H., Vulićević, Lj., Kurko, S. V.,& Ivanović, N.. (2017). Structural stability and local electronic properties of some EC synthesized magnetite nanopowders. in Journal of Alloys and Compounds, 697, 409-416.
https://doi.org/10.1016/j.jallcom.2016.11.090

Radisavljević I, Kuzmanović B, Novaković N, Mahnke H, Vulićević L, Kurko SV, Ivanović N. Structural stability and local electronic properties of some EC synthesized magnetite nanopowders. in Journal of Alloys and Compounds. 2017;697:409-416.
doi:10.1016/j.jallcom.2016.11.090 .

Radisavljević, Ivana, Kuzmanović, Bojana, Novaković, Nikola, Mahnke, Heinz-Eberhard, Vulićević, Lj., Kurko, Sandra V., Ivanović, Nenad, "Structural stability and local electronic properties of some EC synthesized magnetite nanopowders" in Journal of Alloys and Compounds, 697 (2017):409-416,
https://doi.org/10.1016/j.jallcom.2016.11.090 . .

TY  - JOUR
AU  - Umićević, Ana
AU  - Mahnke, Heinz-Eberhard
AU  - Belošević-Čavor, Jelena
AU  - Cekić, Božidar Đ.
AU  - Schumacher, Gerhard
AU  - Mađarević, Ivan
AU  - Koteski, Vasil J.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7091
AB  - X-ray absorption spectroscopy is employed to investigate site preference and lattice relaxation around Mo, Ru, Hf, W and Re dopants in Ni3Al. The site occupation preference and the measured distances between the refractory elements as dopants and the nearest host atoms are compared with the results of ab initio calculations within the density functional theory. Combined experimental and theoretical results indicate that Mo, Hf, W and Re atoms reside on the Al sublattice in Ni3Al, while Ru atoms occupy the Ni sublattice. A more pronounced lattice relaxation was detected in the case of Hf and Ru doping, with a strong outward relaxation of the nearest Ni and Al atoms.
T2  - Journal of Synchrotron Radiation
T1  - Site preference and lattice relaxation around 4d and 5d refractory elements in Ni3Al
VL  - 23
SP  - 286
EP  - 292
DO  - 10.1107/S1600577515020688
ER  - 

@article{
author = "Umićević, Ana and Mahnke, Heinz-Eberhard and Belošević-Čavor, Jelena and Cekić, Božidar Đ. and Schumacher, Gerhard and Mađarević, Ivan and Koteski, Vasil J.",
year = "2016",
abstract = "X-ray absorption spectroscopy is employed to investigate site preference and lattice relaxation around Mo, Ru, Hf, W and Re dopants in Ni3Al. The site occupation preference and the measured distances between the refractory elements as dopants and the nearest host atoms are compared with the results of ab initio calculations within the density functional theory. Combined experimental and theoretical results indicate that Mo, Hf, W and Re atoms reside on the Al sublattice in Ni3Al, while Ru atoms occupy the Ni sublattice. A more pronounced lattice relaxation was detected in the case of Hf and Ru doping, with a strong outward relaxation of the nearest Ni and Al atoms.",
journal = "Journal of Synchrotron Radiation",
title = "Site preference and lattice relaxation around 4d and 5d refractory elements in Ni3Al",
volume = "23",
pages = "286-292",
doi = "10.1107/S1600577515020688"
}

Umićević, A., Mahnke, H., Belošević-Čavor, J., Cekić, B. Đ., Schumacher, G., Mađarević, I.,& Koteski, V. J.. (2016). Site preference and lattice relaxation around 4d and 5d refractory elements in Ni3Al. in Journal of Synchrotron Radiation, 23, 286-292.
https://doi.org/10.1107/S1600577515020688

Umićević A, Mahnke H, Belošević-Čavor J, Cekić BĐ, Schumacher G, Mađarević I, Koteski VJ. Site preference and lattice relaxation around 4d and 5d refractory elements in Ni3Al. in Journal of Synchrotron Radiation. 2016;23:286-292.
doi:10.1107/S1600577515020688 .

Umićević, Ana, Mahnke, Heinz-Eberhard, Belošević-Čavor, Jelena, Cekić, Božidar Đ., Schumacher, Gerhard, Mađarević, Ivan, Koteski, Vasil J., "Site preference and lattice relaxation around 4d and 5d refractory elements in Ni3Al" in Journal of Synchrotron Radiation, 23 (2016):286-292,
https://doi.org/10.1107/S1600577515020688 . .

TY  - JOUR
AU  - Radisavljević, Ivana
AU  - Novaković, Nikola
AU  - Mahnke, Heinz-Eberhard
AU  - Romčević, Nebojša Ž.
AU  - Slankamenac, Miloš P.
AU  - Sekulić, Dalibor L.
AU  - Ivanović, Nenad
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/830
AB  - Structural aspects of Cr and Ni incorporation into the PbTe lattice are studied by means of Extended X-ray Absorption Fine Structure (EXAFS). EXAFS measurements enabled to get exact information on Pb and Te local structural features and their thermal evolution. The obtained results also revealed that by distorting their local environment, impurity atoms (Cr, Ni) add to high inherent disorder already present in the host PbTe. Larger anharmonicity of the Pb-Te bond and larger atomic thermal parameters observed in PbTe(Cr, Ni) could be of interest for thermoelectronics applications since they are both expected to reduce the thermal conductivity.
PB  - Springer Nature
T2  - Journal of Materials Science: Materials in Electronics
T1  - Influence on Cr and Ni doping on PbTe local structural properties
VL  - 26
IS  - 12
SP  - 10020
EP  - 10026
DO  - 10.1007/s10854-015-3682-z
ER  - 

@article{
author = "Radisavljević, Ivana and Novaković, Nikola and Mahnke, Heinz-Eberhard and Romčević, Nebojša Ž. and Slankamenac, Miloš P. and Sekulić, Dalibor L. and Ivanović, Nenad",
year = "2015",
abstract = "Structural aspects of Cr and Ni incorporation into the PbTe lattice are studied by means of Extended X-ray Absorption Fine Structure (EXAFS). EXAFS measurements enabled to get exact information on Pb and Te local structural features and their thermal evolution. The obtained results also revealed that by distorting their local environment, impurity atoms (Cr, Ni) add to high inherent disorder already present in the host PbTe. Larger anharmonicity of the Pb-Te bond and larger atomic thermal parameters observed in PbTe(Cr, Ni) could be of interest for thermoelectronics applications since they are both expected to reduce the thermal conductivity.",
publisher = "Springer Nature",
journal = "Journal of Materials Science: Materials in Electronics",
title = "Influence on Cr and Ni doping on PbTe local structural properties",
volume = "26",
number = "12",
pages = "10020-10026",
doi = "10.1007/s10854-015-3682-z"
}

Radisavljević, I., Novaković, N., Mahnke, H., Romčević, N. Ž., Slankamenac, M. P., Sekulić, D. L.,& Ivanović, N.. (2015). Influence on Cr and Ni doping on PbTe local structural properties. in Journal of Materials Science: Materials in Electronics
Springer Nature., 26(12), 10020-10026.
https://doi.org/10.1007/s10854-015-3682-z

Radisavljević I, Novaković N, Mahnke H, Romčević NŽ, Slankamenac MP, Sekulić DL, Ivanović N. Influence on Cr and Ni doping on PbTe local structural properties. in Journal of Materials Science: Materials in Electronics. 2015;26(12):10020-10026.
doi:10.1007/s10854-015-3682-z .

Radisavljević, Ivana, Novaković, Nikola, Mahnke, Heinz-Eberhard, Romčević, Nebojša Ž., Slankamenac, Miloš P., Sekulić, Dalibor L., Ivanović, Nenad, "Influence on Cr and Ni doping on PbTe local structural properties" in Journal of Materials Science: Materials in Electronics, 26, no. 12 (2015):10020-10026,
https://doi.org/10.1007/s10854-015-3682-z . .

TY  - JOUR
AU  - Radisavljević, Ivana
AU  - Novaković, Nikola
AU  - Mahnke, Heinz-Eberhard
AU  - Romčević, Nebojša Ž.
AU  - Medić, Mirjana
AU  - Paskaš Mamula, Bojana
AU  - Ivanović, Nenad
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5376
AB  - The X-ray absorption near edge structure technique was employed for studies of coordination environments and valence states of impurity atoms (Mn, In and Ga) in a series of narrow band gap PbTe-based semiconductors. Impurity atoms absorption data were analysed with the help of the Real Space Full Multiple Scattering FEFF8.2 code. These results are complemented with band structure calculations using the full potential augmented plane waves method extended by local orbitals using WIEN2k code. Impurity atoms are found to be off-centred from the regular lattice positions each in a specific manner, which leads to formation of significantly different local structures from that expected in host PbTe. Observed structural modifications are accompanied by the change in the impurity atoms valence states. These findings support and extend our previous results obtained with various techniques on this class of materials.
T2  - International Journal of Materials Research
T1  - X-ray absorption near edge structure studies of Pb1-xMnxTe(In, Ga) systems
VL  - 104
IS  - 3
SP  - 319
EP  - 325
DO  - 10.3139/146.110857
ER  - 

@article{
author = "Radisavljević, Ivana and Novaković, Nikola and Mahnke, Heinz-Eberhard and Romčević, Nebojša Ž. and Medić, Mirjana and Paskaš Mamula, Bojana and Ivanović, Nenad",
year = "2013",
abstract = "The X-ray absorption near edge structure technique was employed for studies of coordination environments and valence states of impurity atoms (Mn, In and Ga) in a series of narrow band gap PbTe-based semiconductors. Impurity atoms absorption data were analysed with the help of the Real Space Full Multiple Scattering FEFF8.2 code. These results are complemented with band structure calculations using the full potential augmented plane waves method extended by local orbitals using WIEN2k code. Impurity atoms are found to be off-centred from the regular lattice positions each in a specific manner, which leads to formation of significantly different local structures from that expected in host PbTe. Observed structural modifications are accompanied by the change in the impurity atoms valence states. These findings support and extend our previous results obtained with various techniques on this class of materials.",
journal = "International Journal of Materials Research",
title = "X-ray absorption near edge structure studies of Pb1-xMnxTe(In, Ga) systems",
volume = "104",
number = "3",
pages = "319-325",
doi = "10.3139/146.110857"
}

Radisavljević, I., Novaković, N., Mahnke, H., Romčević, N. Ž., Medić, M., Paskaš Mamula, B.,& Ivanović, N.. (2013). X-ray absorption near edge structure studies of Pb1-xMnxTe(In, Ga) systems. in International Journal of Materials Research, 104(3), 319-325.
https://doi.org/10.3139/146.110857

Radisavljević I, Novaković N, Mahnke H, Romčević NŽ, Medić M, Paskaš Mamula B, Ivanović N. X-ray absorption near edge structure studies of Pb1-xMnxTe(In, Ga) systems. in International Journal of Materials Research. 2013;104(3):319-325.
doi:10.3139/146.110857 .

Radisavljević, Ivana, Novaković, Nikola, Mahnke, Heinz-Eberhard, Romčević, Nebojša Ž., Medić, Mirjana, Paskaš Mamula, Bojana, Ivanović, Nenad, "X-ray absorption near edge structure studies of Pb1-xMnxTe(In, Ga) systems" in International Journal of Materials Research, 104, no. 3 (2013):319-325,
https://doi.org/10.3139/146.110857 . .

TY  - JOUR
AU  - Radisavljević, Ivana
AU  - Ivanović, Nenad
AU  - Novaković, Nikola
AU  - Romčević, Nebojša Ž.
AU  - Mitrić, Miodrag
AU  - Andrić, Velibor
AU  - Mahnke, Heinz-Eberhard
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5671
AB  - The paper presents the extended results of structural investigations of Pb0.9Mn0.1Te, and Pb0.9Mn0.1Te systems doped with In (2 at.%) and Ga (4 at.%) by means of EXAFS (extended X-ray absorption fine structure) technique. EXAFS measurements performed at Te-, Mn-, In- and Ga-K absorption edges at different temperatures are complemented with X-ray diffraction, flame absorption and X-ray fluorescence analysis. That way the complete information about elemental concentration; crystal structure; local environment around constitutive and impurity atoms (including their displacements from the regular lattice positions); local and long-range ordering; and the overall influence of doping on the host crystal structure is derived. The obtained results represent an important step towards understanding the structural aspects of doping of lead telluride-based semiconductors with Mn and group III elements and their connection to electronic and optical phenomena important for their applications.
T2  - Journal of Materials Science
T1  - Structural aspects of changes induced in PbTe by doping with Mn, In and Ga
VL  - 48
IS  - 23
SP  - 8084
EP  - 8100
DO  - 10.1007/s10853-013-7621-1
ER  - 

@article{
author = "Radisavljević, Ivana and Ivanović, Nenad and Novaković, Nikola and Romčević, Nebojša Ž. and Mitrić, Miodrag and Andrić, Velibor and Mahnke, Heinz-Eberhard",
year = "2013",
abstract = "The paper presents the extended results of structural investigations of Pb0.9Mn0.1Te, and Pb0.9Mn0.1Te systems doped with In (2 at.%) and Ga (4 at.%) by means of EXAFS (extended X-ray absorption fine structure) technique. EXAFS measurements performed at Te-, Mn-, In- and Ga-K absorption edges at different temperatures are complemented with X-ray diffraction, flame absorption and X-ray fluorescence analysis. That way the complete information about elemental concentration; crystal structure; local environment around constitutive and impurity atoms (including their displacements from the regular lattice positions); local and long-range ordering; and the overall influence of doping on the host crystal structure is derived. The obtained results represent an important step towards understanding the structural aspects of doping of lead telluride-based semiconductors with Mn and group III elements and their connection to electronic and optical phenomena important for their applications.",
journal = "Journal of Materials Science",
title = "Structural aspects of changes induced in PbTe by doping with Mn, In and Ga",
volume = "48",
number = "23",
pages = "8084-8100",
doi = "10.1007/s10853-013-7621-1"
}

Radisavljević, I., Ivanović, N., Novaković, N., Romčević, N. Ž., Mitrić, M., Andrić, V.,& Mahnke, H.. (2013). Structural aspects of changes induced in PbTe by doping with Mn, In and Ga. in Journal of Materials Science, 48(23), 8084-8100.
https://doi.org/10.1007/s10853-013-7621-1

Radisavljević I, Ivanović N, Novaković N, Romčević NŽ, Mitrić M, Andrić V, Mahnke H. Structural aspects of changes induced in PbTe by doping with Mn, In and Ga. in Journal of Materials Science. 2013;48(23):8084-8100.
doi:10.1007/s10853-013-7621-1 .

Radisavljević, Ivana, Ivanović, Nenad, Novaković, Nikola, Romčević, Nebojša Ž., Mitrić, Miodrag, Andrić, Velibor, Mahnke, Heinz-Eberhard, "Structural aspects of changes induced in PbTe by doping with Mn, In and Ga" in Journal of Materials Science, 48, no. 23 (2013):8084-8100,
https://doi.org/10.1007/s10853-013-7621-1 . .

TY  - JOUR
AU  - Koteski, Vasil J.
AU  - Belošević-Čavor, Jelena
AU  - Fochuk, Petro
AU  - Mahnke, Heinz-Eberhard
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6990
AB  - The lattice relaxation around Ga in CdTe is investigated by means of extended X-ray absorption spectroscopy (EXAFS) and density functional theory (DFT) calculations using the linear augmented plane waves plus local orbitals (LAPW+lo) method. In addition to the substitutional position, the calculations are performed for DX- and A-centers of Ga in CdTe. The results of the calculations are in good agreement with the experimental data, as obtained from EXAFS and X-ray absorption near-edge structure (XANES). They allow the experimental identification of several defect structures in CdTe. In particular, direct experimental evidence for the existence of DX-centers in CdTe is provided, and for the first time the local bond lengths of this defect are measured directly.
T2  - Journal of Synchrotron Radiation
T1  - Local and electronic structure around Ga in CdTe: evidence of DX- and A-centers
VL  - 20
SP  - 166
EP  - 171
DO  - 10.1107/S0909049512042197
ER  - 

@article{
author = "Koteski, Vasil J. and Belošević-Čavor, Jelena and Fochuk, Petro and Mahnke, Heinz-Eberhard",
year = "2013",
abstract = "The lattice relaxation around Ga in CdTe is investigated by means of extended X-ray absorption spectroscopy (EXAFS) and density functional theory (DFT) calculations using the linear augmented plane waves plus local orbitals (LAPW+lo) method. In addition to the substitutional position, the calculations are performed for DX- and A-centers of Ga in CdTe. The results of the calculations are in good agreement with the experimental data, as obtained from EXAFS and X-ray absorption near-edge structure (XANES). They allow the experimental identification of several defect structures in CdTe. In particular, direct experimental evidence for the existence of DX-centers in CdTe is provided, and for the first time the local bond lengths of this defect are measured directly.",
journal = "Journal of Synchrotron Radiation",
title = "Local and electronic structure around Ga in CdTe: evidence of DX- and A-centers",
volume = "20",
pages = "166-171",
doi = "10.1107/S0909049512042197"
}

Koteski, V. J., Belošević-Čavor, J., Fochuk, P.,& Mahnke, H.. (2013). Local and electronic structure around Ga in CdTe: evidence of DX- and A-centers. in Journal of Synchrotron Radiation, 20, 166-171.
https://doi.org/10.1107/S0909049512042197

Koteski VJ, Belošević-Čavor J, Fochuk P, Mahnke H. Local and electronic structure around Ga in CdTe: evidence of DX- and A-centers. in Journal of Synchrotron Radiation. 2013;20:166-171.
doi:10.1107/S0909049512042197 .

Koteski, Vasil J., Belošević-Čavor, Jelena, Fochuk, Petro, Mahnke, Heinz-Eberhard, "Local and electronic structure around Ga in CdTe: evidence of DX- and A-centers" in Journal of Synchrotron Radiation, 20 (2013):166-171,
https://doi.org/10.1107/S0909049512042197 . .

TY  - JOUR
AU  - Radisavljević, Ivana
AU  - Novaković, Nikola
AU  - Romčević, Nebojša Ž.
AU  - Manasijević, Miodrag
AU  - Mahnke, Heinz-Eberhard
AU  - Ivanović, Nenad
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4033
AB  - X-ray Absorption Fine Structure (XAFS) measurements were performed on uniformly doped PbTe:Yb (1.3 at.%) at all elemental absorption edges and the analysis of the results has provided precise information on the local structure around each atom. From the near edge part of the absorption spectra it was determined that Yb is in the mixed valent state, which is predominantly divalent with a small trivalent contribution. The analysis of the high energy region of the absorption spectra revealed that Yb incorporation causes deformation of the host PbTe lattice, manifested through extension of all the nearest-, and next-nearest neighbour distances. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - XAFS studies of ytterbium doped lead-telluride
VL  - 501
IS  - 1
SP  - 159
EP  - 163
DO  - 10.1016/j.jallcom.2010.04.068
ER  - 

@article{
author = "Radisavljević, Ivana and Novaković, Nikola and Romčević, Nebojša Ž. and Manasijević, Miodrag and Mahnke, Heinz-Eberhard and Ivanović, Nenad",
year = "2010",
abstract = "X-ray Absorption Fine Structure (XAFS) measurements were performed on uniformly doped PbTe:Yb (1.3 at.%) at all elemental absorption edges and the analysis of the results has provided precise information on the local structure around each atom. From the near edge part of the absorption spectra it was determined that Yb is in the mixed valent state, which is predominantly divalent with a small trivalent contribution. The analysis of the high energy region of the absorption spectra revealed that Yb incorporation causes deformation of the host PbTe lattice, manifested through extension of all the nearest-, and next-nearest neighbour distances. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "XAFS studies of ytterbium doped lead-telluride",
volume = "501",
number = "1",
pages = "159-163",
doi = "10.1016/j.jallcom.2010.04.068"
}

Radisavljević, I., Novaković, N., Romčević, N. Ž., Manasijević, M., Mahnke, H.,& Ivanović, N.. (2010). XAFS studies of ytterbium doped lead-telluride. in Journal of Alloys and Compounds, 501(1), 159-163.
https://doi.org/10.1016/j.jallcom.2010.04.068

Radisavljević I, Novaković N, Romčević NŽ, Manasijević M, Mahnke H, Ivanović N. XAFS studies of ytterbium doped lead-telluride. in Journal of Alloys and Compounds. 2010;501(1):159-163.
doi:10.1016/j.jallcom.2010.04.068 .

Radisavljević, Ivana, Novaković, Nikola, Romčević, Nebojša Ž., Manasijević, Miodrag, Mahnke, Heinz-Eberhard, Ivanović, Nenad, "XAFS studies of ytterbium doped lead-telluride" in Journal of Alloys and Compounds, 501, no. 1 (2010):159-163,
https://doi.org/10.1016/j.jallcom.2010.04.068 . .

TY  - JOUR
AU  - Koteski, Vasil J.
AU  - Doka-Yamigno, S.
AU  - Hofstetter, J.
AU  - Rusu, M.
AU  - Mahnke, Heinz-Eberhard
AU  - Lux-Steiner, M. Ch
AU  - Schedel-Niedrig, Th
AU  - Arushanov, E.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4292
AB  - We present here a complementary study on germanium doping of the wider-band-gap CuGaSe2 (CGS) chalcopyrite. In photoluminescence studies, the occurrence of a new emission line was identified as Ge related and explained as a donor-acceptor-pair recombination. The precise role the Ge is playing in this doping of CGS is revealed by x-ray absorption spectroscopy and ab initio calculations based on the density-functional theory. Extended x-ray absorption fine-structure spectroscopy (EXAFS) as well as x-ray absorption near-edge spectroscopy performed at the Ge K-, Cu K-, and Ga K-edge show that the Ge dopants occupy the cationic sites of Ge-Cu or Ge-Ga of the host lattice. The complementary ab initio calculations support the EXAFS results. They further indicate that the incorporated Ge atoms preferentially occupy Ga sites when relaxation around the dopant is taken into account. Additionally, our corresponding theoretical band-structure model predicts the existence of additional localized electronic acceptor and donor defect bands within the band gap of CuGaSe2 originating from a strong covalent interaction between Ge 4s and Se 4p states for Ge atoms tetrahedrally surrounded by the Se nearest-neighbor atoms. A theoretically predicted antibonding Ge-Se 4sp(3) defect band appearing well above the Fermi level for the Ge-Ga(1+) point-defect system can be directly linked to a Ge-dopant-related donor-acceptor-pair transition as observed in our photoluminescence spectra.
T2  - Physical Review B: Condensed Matter and Materials Physics
T1  - Germanium doping of wider-band-gap CuGaSe2 chalcopyrites: Local and electronic structure
VL  - 81
IS  - 24
DO  - 10.1103/PhysRevB.81.245213
ER  - 

@article{
author = "Koteski, Vasil J. and Doka-Yamigno, S. and Hofstetter, J. and Rusu, M. and Mahnke, Heinz-Eberhard and Lux-Steiner, M. Ch and Schedel-Niedrig, Th and Arushanov, E.",
year = "2010",
abstract = "We present here a complementary study on germanium doping of the wider-band-gap CuGaSe2 (CGS) chalcopyrite. In photoluminescence studies, the occurrence of a new emission line was identified as Ge related and explained as a donor-acceptor-pair recombination. The precise role the Ge is playing in this doping of CGS is revealed by x-ray absorption spectroscopy and ab initio calculations based on the density-functional theory. Extended x-ray absorption fine-structure spectroscopy (EXAFS) as well as x-ray absorption near-edge spectroscopy performed at the Ge K-, Cu K-, and Ga K-edge show that the Ge dopants occupy the cationic sites of Ge-Cu or Ge-Ga of the host lattice. The complementary ab initio calculations support the EXAFS results. They further indicate that the incorporated Ge atoms preferentially occupy Ga sites when relaxation around the dopant is taken into account. Additionally, our corresponding theoretical band-structure model predicts the existence of additional localized electronic acceptor and donor defect bands within the band gap of CuGaSe2 originating from a strong covalent interaction between Ge 4s and Se 4p states for Ge atoms tetrahedrally surrounded by the Se nearest-neighbor atoms. A theoretically predicted antibonding Ge-Se 4sp(3) defect band appearing well above the Fermi level for the Ge-Ga(1+) point-defect system can be directly linked to a Ge-dopant-related donor-acceptor-pair transition as observed in our photoluminescence spectra.",
journal = "Physical Review B: Condensed Matter and Materials Physics",
title = "Germanium doping of wider-band-gap CuGaSe2 chalcopyrites: Local and electronic structure",
volume = "81",
number = "24",
doi = "10.1103/PhysRevB.81.245213"
}

Koteski, V. J., Doka-Yamigno, S., Hofstetter, J., Rusu, M., Mahnke, H., Lux-Steiner, M. C., Schedel-Niedrig, T.,& Arushanov, E.. (2010). Germanium doping of wider-band-gap CuGaSe2 chalcopyrites: Local and electronic structure. in Physical Review B: Condensed Matter and Materials Physics, 81(24).
https://doi.org/10.1103/PhysRevB.81.245213

Koteski VJ, Doka-Yamigno S, Hofstetter J, Rusu M, Mahnke H, Lux-Steiner MC, Schedel-Niedrig T, Arushanov E. Germanium doping of wider-band-gap CuGaSe2 chalcopyrites: Local and electronic structure. in Physical Review B: Condensed Matter and Materials Physics. 2010;81(24).
doi:10.1103/PhysRevB.81.245213 .

Koteski, Vasil J., Doka-Yamigno, S., Hofstetter, J., Rusu, M., Mahnke, Heinz-Eberhard, Lux-Steiner, M. Ch, Schedel-Niedrig, Th, Arushanov, E., "Germanium doping of wider-band-gap CuGaSe2 chalcopyrites: Local and electronic structure" in Physical Review B: Condensed Matter and Materials Physics, 81, no. 24 (2010),
https://doi.org/10.1103/PhysRevB.81.245213 . .

TY  - JOUR
AU  - Mechler, S.
AU  - Schumacher, G.
AU  - Koteski, Vasil J.
AU  - Riesemeier, H.
AU  - Schaefers, F.
AU  - Mahnke, Heinz-Eberhard
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4080
AB  - Local structures of amorphous and quasicrystalline phases in Zr-Ti-Ni and Zr-Ti-Ni-Cu alloys have been studied by means of x-ray absorption spectroscopy. The amorphous phases show a high degree of icosahedral short-range order. In all investigated systems local order around Cu and Ni atoms was found to be nearly identical pointing to site substitution of Ni by Cu as the reason for an improved glass forming ability when Ni is partly substituted by Cu. The results strengthen an icosahedral cluster based approach for the structure of metallic glasses and indicate the importance of the medium-range order on glass formation. (C) 2010 American Institute of Physics. [doi:10.1063/1.3467265]
T2  - Applied Physics Letters
T1  - Local structure and site substitution in amorphous and quasicrystalline Zr-Ti-Ni-(Cu) alloys
VL  - 97
IS  - 4
DO  - 10.1063/1.3467265
ER  - 

@article{
author = "Mechler, S. and Schumacher, G. and Koteski, Vasil J. and Riesemeier, H. and Schaefers, F. and Mahnke, Heinz-Eberhard",
year = "2010",
abstract = "Local structures of amorphous and quasicrystalline phases in Zr-Ti-Ni and Zr-Ti-Ni-Cu alloys have been studied by means of x-ray absorption spectroscopy. The amorphous phases show a high degree of icosahedral short-range order. In all investigated systems local order around Cu and Ni atoms was found to be nearly identical pointing to site substitution of Ni by Cu as the reason for an improved glass forming ability when Ni is partly substituted by Cu. The results strengthen an icosahedral cluster based approach for the structure of metallic glasses and indicate the importance of the medium-range order on glass formation. (C) 2010 American Institute of Physics. [doi:10.1063/1.3467265]",
journal = "Applied Physics Letters",
title = "Local structure and site substitution in amorphous and quasicrystalline Zr-Ti-Ni-(Cu) alloys",
volume = "97",
number = "4",
doi = "10.1063/1.3467265"
}

Mechler, S., Schumacher, G., Koteski, V. J., Riesemeier, H., Schaefers, F.,& Mahnke, H.. (2010). Local structure and site substitution in amorphous and quasicrystalline Zr-Ti-Ni-(Cu) alloys. in Applied Physics Letters, 97(4).
https://doi.org/10.1063/1.3467265

Mechler S, Schumacher G, Koteski VJ, Riesemeier H, Schaefers F, Mahnke H. Local structure and site substitution in amorphous and quasicrystalline Zr-Ti-Ni-(Cu) alloys. in Applied Physics Letters. 2010;97(4).
doi:10.1063/1.3467265 .

Mechler, S., Schumacher, G., Koteski, Vasil J., Riesemeier, H., Schaefers, F., Mahnke, Heinz-Eberhard, "Local structure and site substitution in amorphous and quasicrystalline Zr-Ti-Ni-(Cu) alloys" in Applied Physics Letters, 97, no. 4 (2010),
https://doi.org/10.1063/1.3467265 . .

TY  - JOUR
AU  - Radisavljević, Ivana
AU  - Novaković, Nikola
AU  - Ivanović, Nenad
AU  - Romčević, Nebojša Ž.
AU  - Manasijević, Miodrag
AU  - Mahnke, Heinz-Eberhard
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6866
AB  - The problem of impurities and defect states in lead telluride-based semiconductors is of crucial importance for their practical applications. X-ray absorption fine structure (XAFS) techniques are capable to address some of the key issues regarding impurities position, their valent state, as well as the local structural changes of the host lattice in the immediate surrounding of the impurity atoms. In this paper we present the results of the Ni K-absorption edge XAFS studies of Ni-doped PbTe at different temperatures. Analysis of near edge and extended XAFS regions of the measured spectra provided information about exact local environment and lattice ordering around Ni atoms. (C) 2009 Elsevier B.V. All rights reserved.
T2  - Physica B: Condensed Matter
T1  - XAFS studies of nickel-doped lead telluride
VL  - 404
IS  - 23-24
SP  - 5032
EP  - 5034
DO  - 10.1016/j.physb.2009.08.209
ER  - 

@article{
author = "Radisavljević, Ivana and Novaković, Nikola and Ivanović, Nenad and Romčević, Nebojša Ž. and Manasijević, Miodrag and Mahnke, Heinz-Eberhard",
year = "2009",
abstract = "The problem of impurities and defect states in lead telluride-based semiconductors is of crucial importance for their practical applications. X-ray absorption fine structure (XAFS) techniques are capable to address some of the key issues regarding impurities position, their valent state, as well as the local structural changes of the host lattice in the immediate surrounding of the impurity atoms. In this paper we present the results of the Ni K-absorption edge XAFS studies of Ni-doped PbTe at different temperatures. Analysis of near edge and extended XAFS regions of the measured spectra provided information about exact local environment and lattice ordering around Ni atoms. (C) 2009 Elsevier B.V. All rights reserved.",
journal = "Physica B: Condensed Matter",
title = "XAFS studies of nickel-doped lead telluride",
volume = "404",
number = "23-24",
pages = "5032-5034",
doi = "10.1016/j.physb.2009.08.209"
}

Radisavljević, I., Novaković, N., Ivanović, N., Romčević, N. Ž., Manasijević, M.,& Mahnke, H.. (2009). XAFS studies of nickel-doped lead telluride. in Physica B: Condensed Matter, 404(23-24), 5032-5034.
https://doi.org/10.1016/j.physb.2009.08.209

Radisavljević I, Novaković N, Ivanović N, Romčević NŽ, Manasijević M, Mahnke H. XAFS studies of nickel-doped lead telluride. in Physica B: Condensed Matter. 2009;404(23-24):5032-5034.
doi:10.1016/j.physb.2009.08.209 .

Radisavljević, Ivana, Novaković, Nikola, Ivanović, Nenad, Romčević, Nebojša Ž., Manasijević, Miodrag, Mahnke, Heinz-Eberhard, "XAFS studies of nickel-doped lead telluride" in Physica B: Condensed Matter, 404, no. 23-24 (2009):5032-5034,
https://doi.org/10.1016/j.physb.2009.08.209 . .

TY  - JOUR
AU  - Koteski, Vasil J.
AU  - Mahnke, Heinz-Eberhard
AU  - Belošević-Čavor, Jelena
AU  - Cekić, Božidar Đ.
AU  - Schumacher, G.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3551
AB  - The lattice relaxation around Mo, Ru, Hf, Ta, W and Re in Ni is investigated by means of X-ray absorption spectroscopy. For all of the investigated concentrations the substitutional lattice position is confirmed except for the higher Hf concentration where different phases are observed. Ail outward relaxation of the neighboring atoms is detected with clear trends of increasing nearest neighbor distances with decreasing valence for the 5d impurities, and separate trends for the 4d impurities. Ab initio supercell calculations within the linearized augmented plane wave formalism are used to complement the experimental results and allow for a better interpretation of the experimental trends in terms of the electronic structure of the impurity. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
T2  - Acta Materialia
T1  - Experimental and theoretical study of lattice relaxation around refractory atoms in nickel
VL  - 56
IS  - 17
SP  - 4601
EP  - 4607
DO  - 10.1016/j.actamat.2008.05.015
ER  - 

@article{
author = "Koteski, Vasil J. and Mahnke, Heinz-Eberhard and Belošević-Čavor, Jelena and Cekić, Božidar Đ. and Schumacher, G.",
year = "2008",
abstract = "The lattice relaxation around Mo, Ru, Hf, Ta, W and Re in Ni is investigated by means of X-ray absorption spectroscopy. For all of the investigated concentrations the substitutional lattice position is confirmed except for the higher Hf concentration where different phases are observed. Ail outward relaxation of the neighboring atoms is detected with clear trends of increasing nearest neighbor distances with decreasing valence for the 5d impurities, and separate trends for the 4d impurities. Ab initio supercell calculations within the linearized augmented plane wave formalism are used to complement the experimental results and allow for a better interpretation of the experimental trends in terms of the electronic structure of the impurity. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.",
journal = "Acta Materialia",
title = "Experimental and theoretical study of lattice relaxation around refractory atoms in nickel",
volume = "56",
number = "17",
pages = "4601-4607",
doi = "10.1016/j.actamat.2008.05.015"
}

Koteski, V. J., Mahnke, H., Belošević-Čavor, J., Cekić, B. Đ.,& Schumacher, G.. (2008). Experimental and theoretical study of lattice relaxation around refractory atoms in nickel. in Acta Materialia, 56(17), 4601-4607.
https://doi.org/10.1016/j.actamat.2008.05.015

Koteski VJ, Mahnke H, Belošević-Čavor J, Cekić BĐ, Schumacher G. Experimental and theoretical study of lattice relaxation around refractory atoms in nickel. in Acta Materialia. 2008;56(17):4601-4607.
doi:10.1016/j.actamat.2008.05.015 .

Koteski, Vasil J., Mahnke, Heinz-Eberhard, Belošević-Čavor, Jelena, Cekić, Božidar Đ., Schumacher, G., "Experimental and theoretical study of lattice relaxation around refractory atoms in nickel" in Acta Materialia, 56, no. 17 (2008):4601-4607,
https://doi.org/10.1016/j.actamat.2008.05.015 . .

TY  - JOUR
AU  - Mahnke, Heinz-Eberhard
AU  - Zizak, I.
AU  - Schubert-Bischoff, P.
AU  - Koteski, Vasil J.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3458
AB  - The formation of silver-metal clusters has been studied in ion-exchanged soda-lime glass following swift heavy ion irradiation at ISL. While the transformation into a metallic chemical form was detected with X-ray absorption spectroscopy (EXAFS) the shape and geometrical arrangement was studied both by transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS). A chain-like arrangement of nanoclusters, of approximately 7 nm in diameter observed in TEM was further investigated with in situ SAXS during the subsequent annealing process. (C) 2007 Elsevier B.V. All rights reserved.
T2  - Materials Science and Engineering. B: Advanced Functional Solid-State Materials
T1  - Ion-beam induced nano-sized Ag-metal clusters in glass
VL  - 149
IS  - 2
SP  - 200
EP  - 203
DO  - 10.1016/j.mseb.2007.11.036
ER  - 

@article{
author = "Mahnke, Heinz-Eberhard and Zizak, I. and Schubert-Bischoff, P. and Koteski, Vasil J.",
year = "2008",
abstract = "The formation of silver-metal clusters has been studied in ion-exchanged soda-lime glass following swift heavy ion irradiation at ISL. While the transformation into a metallic chemical form was detected with X-ray absorption spectroscopy (EXAFS) the shape and geometrical arrangement was studied both by transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS). A chain-like arrangement of nanoclusters, of approximately 7 nm in diameter observed in TEM was further investigated with in situ SAXS during the subsequent annealing process. (C) 2007 Elsevier B.V. All rights reserved.",
journal = "Materials Science and Engineering. B: Advanced Functional Solid-State Materials",
title = "Ion-beam induced nano-sized Ag-metal clusters in glass",
volume = "149",
number = "2",
pages = "200-203",
doi = "10.1016/j.mseb.2007.11.036"
}

Mahnke, H., Zizak, I., Schubert-Bischoff, P.,& Koteski, V. J.. (2008). Ion-beam induced nano-sized Ag-metal clusters in glass. in Materials Science and Engineering. B: Advanced Functional Solid-State Materials, 149(2), 200-203.
https://doi.org/10.1016/j.mseb.2007.11.036

Mahnke H, Zizak I, Schubert-Bischoff P, Koteski VJ. Ion-beam induced nano-sized Ag-metal clusters in glass. in Materials Science and Engineering. B: Advanced Functional Solid-State Materials. 2008;149(2):200-203.
doi:10.1016/j.mseb.2007.11.036 .

Mahnke, Heinz-Eberhard, Zizak, I., Schubert-Bischoff, P., Koteski, Vasil J., "Ion-beam induced nano-sized Ag-metal clusters in glass" in Materials Science and Engineering. B: Advanced Functional Solid-State Materials, 149, no. 2 (2008):200-203,
https://doi.org/10.1016/j.mseb.2007.11.036 . .

TY  - JOUR
AU  - Radisavljević, Ivana
AU  - Ivanović, Nenad
AU  - Novaković, Nikola
AU  - Romčević, Nebojša Ž.
AU  - Mitrić, Miodrag
AU  - Andrić, Velibor
AU  - Mahnke, Heinz-Eberhard
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6654
AB  - The semimagnetic semiconductor Pb1-xMnxTe is a good representative of IV-VI narrow-gap semiconductors, the class of materials in which phenomena like variation of the band gap with composition, negative magnetoresistance, long-term non-equilibrium processes, and the phonon dispersion anomalies, have been readily observed. The off-centering effects (i.e. displacement of the atoms from the regular lattice positions), and related low temperature ferroelectric phase transition, are also characteristic of these systems. In the attempt to resolve exact positions of both constitutive and impurity atoms, possibilities and features of their ordering and (or) clustering, and configurational and thermal disorder in the systems, we have performed EXAFS measurements at DESY-HASYLAB X1 and A1 beam lines, on Te and Mn absorption K-edges, for samples with different Mn concentrations (x = 0.002, 0.02, 0.1) at room temperature and 10 K. The results reveal that these systems are intrinsically quite disordered. The most significant deviations of the local structure from that predicted by X-ray diffraction measurements are found around Mn atoms, and increase with Mn concentration. Copyright (c) 2007 John Wiley and Sons, Ltd.
T2  - X-Ray Spectrometry
T1  - Local structures in Pb1-xMnxTe systems
VL  - 36
IS  - 3
SP  - 150
EP  - 157
DO  - 10.1002/xrs.955
ER  - 

@article{
author = "Radisavljević, Ivana and Ivanović, Nenad and Novaković, Nikola and Romčević, Nebojša Ž. and Mitrić, Miodrag and Andrić, Velibor and Mahnke, Heinz-Eberhard",
year = "2007",
abstract = "The semimagnetic semiconductor Pb1-xMnxTe is a good representative of IV-VI narrow-gap semiconductors, the class of materials in which phenomena like variation of the band gap with composition, negative magnetoresistance, long-term non-equilibrium processes, and the phonon dispersion anomalies, have been readily observed. The off-centering effects (i.e. displacement of the atoms from the regular lattice positions), and related low temperature ferroelectric phase transition, are also characteristic of these systems. In the attempt to resolve exact positions of both constitutive and impurity atoms, possibilities and features of their ordering and (or) clustering, and configurational and thermal disorder in the systems, we have performed EXAFS measurements at DESY-HASYLAB X1 and A1 beam lines, on Te and Mn absorption K-edges, for samples with different Mn concentrations (x = 0.002, 0.02, 0.1) at room temperature and 10 K. The results reveal that these systems are intrinsically quite disordered. The most significant deviations of the local structure from that predicted by X-ray diffraction measurements are found around Mn atoms, and increase with Mn concentration. Copyright (c) 2007 John Wiley and Sons, Ltd.",
journal = "X-Ray Spectrometry",
title = "Local structures in Pb1-xMnxTe systems",
volume = "36",
number = "3",
pages = "150-157",
doi = "10.1002/xrs.955"
}

Radisavljević, I., Ivanović, N., Novaković, N., Romčević, N. Ž., Mitrić, M., Andrić, V.,& Mahnke, H.. (2007). Local structures in Pb1-xMnxTe systems. in X-Ray Spectrometry, 36(3), 150-157.
https://doi.org/10.1002/xrs.955

Radisavljević I, Ivanović N, Novaković N, Romčević NŽ, Mitrić M, Andrić V, Mahnke H. Local structures in Pb1-xMnxTe systems. in X-Ray Spectrometry. 2007;36(3):150-157.
doi:10.1002/xrs.955 .

Radisavljević, Ivana, Ivanović, Nenad, Novaković, Nikola, Romčević, Nebojša Ž., Mitrić, Miodrag, Andrić, Velibor, Mahnke, Heinz-Eberhard, "Local structures in Pb1-xMnxTe systems" in X-Ray Spectrometry, 36, no. 3 (2007):150-157,
https://doi.org/10.1002/xrs.955 . .

TY  - JOUR
AU  - Koteski, Vasil J.
AU  - Zhou, H.
AU  - Farangis, B.
AU  - Hofmann, D. M.
AU  - Meyer, B. K.
AU  - Mahnke, Heinz-Eberhard
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6659
AB  - Among the diluted magnetic semiconductors of current interest, especially ZnO is experiencing a renaissance with the incorporation of Mn because of the recent predictions from theory. We have obtained local structure information from X-ray Absorption Spectroscopy (XAS) complementing previous electron paramagnetic resonance (EPR) studies on Mn in ZnO nanocrystals and Zn(OH)(2). Mn is found to be incorporated substitutionally into the ZnO nanocrystals with a sizeable distortion as compared to the regular ZnO lattice structure. Depending on the preparation of the nanocrystals Mn is found in the ZnO core as well as in a Zn(OH), surface shell with a fraction which decreases upon annealing as the shell disintegrates forming additional ZnO. No indications for Mn clusters were found. (c) 2007 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim.
T2  - Physica Status Solidi. B: Basic Solid State Physics
T1  - Local structure around Mn in Mn containing ZnO nanocrystals
VL  - 244
IS  - 5
SP  - 1578
EP  - 1582
DO  - 10.1002/pssb.200675139
ER  - 

@article{
author = "Koteski, Vasil J. and Zhou, H. and Farangis, B. and Hofmann, D. M. and Meyer, B. K. and Mahnke, Heinz-Eberhard",
year = "2007",
abstract = "Among the diluted magnetic semiconductors of current interest, especially ZnO is experiencing a renaissance with the incorporation of Mn because of the recent predictions from theory. We have obtained local structure information from X-ray Absorption Spectroscopy (XAS) complementing previous electron paramagnetic resonance (EPR) studies on Mn in ZnO nanocrystals and Zn(OH)(2). Mn is found to be incorporated substitutionally into the ZnO nanocrystals with a sizeable distortion as compared to the regular ZnO lattice structure. Depending on the preparation of the nanocrystals Mn is found in the ZnO core as well as in a Zn(OH), surface shell with a fraction which decreases upon annealing as the shell disintegrates forming additional ZnO. No indications for Mn clusters were found. (c) 2007 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim.",
journal = "Physica Status Solidi. B: Basic Solid State Physics",
title = "Local structure around Mn in Mn containing ZnO nanocrystals",
volume = "244",
number = "5",
pages = "1578-1582",
doi = "10.1002/pssb.200675139"
}

Koteski, V. J., Zhou, H., Farangis, B., Hofmann, D. M., Meyer, B. K.,& Mahnke, H.. (2007). Local structure around Mn in Mn containing ZnO nanocrystals. in Physica Status Solidi. B: Basic Solid State Physics, 244(5), 1578-1582.
https://doi.org/10.1002/pssb.200675139

Koteski VJ, Zhou H, Farangis B, Hofmann DM, Meyer BK, Mahnke H. Local structure around Mn in Mn containing ZnO nanocrystals. in Physica Status Solidi. B: Basic Solid State Physics. 2007;244(5):1578-1582.
doi:10.1002/pssb.200675139 .

Koteski, Vasil J., Zhou, H., Farangis, B., Hofmann, D. M., Meyer, B. K., Mahnke, Heinz-Eberhard, "Local structure around Mn in Mn containing ZnO nanocrystals" in Physica Status Solidi. B: Basic Solid State Physics, 244, no. 5 (2007):1578-1582,
https://doi.org/10.1002/pssb.200675139 . .

TY  - JOUR
AU  - Umićević, Ana
AU  - Mahnke, Heinz-Eberhard
AU  - Cekić, Božidar Đ.
AU  - Grbović, Jasmina
AU  - Koteski, Vasil J.
AU  - Belošević-Čavor, Jelena
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6610
AB  - The alloying and phase formation in Ni-Hf samples with 0.2-, 2-, and 5-at.% Hf were studied by X-ray diffraction (XRD) technique and scanning electron microscopy (SEM). Both characterization methods, XRD and SEM, reveal the presence of the HfNi5 phase (fee structure) where the excess Ni atoms are present in the form of Ni or Ni-rich segregations in the sample containing 5-at.% Hf. The sample with 2-at.% Hf is characterized by the presence of the two phases present in the 5-at.% sample and by Hf atoms, which occupy substitutional lattice positions in the Ni lattice. Finally, in the third sample with 0.2-at.% Hf, the Hf atoms mainly substitute the Ni atoms in the lattice. This analysis is being complemented with additional information on the local structure around Hf by extended X-ray absorption fine structure spectroscopy (EXAFS).
T2  - Materials Science Forum
T1  - SEM and XRD characterization of Ni-Hf alloys at low Hf concentration
VL  - 518
SP  - 325
EP  - 330
DO  - 10.4028/www.scientific.net/msf.518.325
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6610
ER  - 

@article{
author = "Umićević, Ana and Mahnke, Heinz-Eberhard and Cekić, Božidar Đ. and Grbović, Jasmina and Koteski, Vasil J. and Belošević-Čavor, Jelena",
year = "2006",
abstract = "The alloying and phase formation in Ni-Hf samples with 0.2-, 2-, and 5-at.% Hf were studied by X-ray diffraction (XRD) technique and scanning electron microscopy (SEM). Both characterization methods, XRD and SEM, reveal the presence of the HfNi5 phase (fee structure) where the excess Ni atoms are present in the form of Ni or Ni-rich segregations in the sample containing 5-at.% Hf. The sample with 2-at.% Hf is characterized by the presence of the two phases present in the 5-at.% sample and by Hf atoms, which occupy substitutional lattice positions in the Ni lattice. Finally, in the third sample with 0.2-at.% Hf, the Hf atoms mainly substitute the Ni atoms in the lattice. This analysis is being complemented with additional information on the local structure around Hf by extended X-ray absorption fine structure spectroscopy (EXAFS).",
journal = "Materials Science Forum",
title = "SEM and XRD characterization of Ni-Hf alloys at low Hf concentration",
volume = "518",
pages = "325-330",
doi = "10.4028/www.scientific.net/msf.518.325",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6610"
}

Umićević, A., Mahnke, H., Cekić, B. Đ., Grbović, J., Koteski, V. J.,& Belošević-Čavor, J.. (2006). SEM and XRD characterization of Ni-Hf alloys at low Hf concentration. in Materials Science Forum, 518, 325-330.
https://doi.org/10.4028/www.scientific.net/msf.518.325
https://hdl.handle.net/21.15107/rcub_vinar_6610

Umićević A, Mahnke H, Cekić BĐ, Grbović J, Koteski VJ, Belošević-Čavor J. SEM and XRD characterization of Ni-Hf alloys at low Hf concentration. in Materials Science Forum. 2006;518:325-330.
doi:10.4028/www.scientific.net/msf.518.325
https://hdl.handle.net/21.15107/rcub_vinar_6610 .

Umićević, Ana, Mahnke, Heinz-Eberhard, Cekić, Božidar Đ., Grbović, Jasmina, Koteski, Vasil J., Belošević-Čavor, Jelena, "SEM and XRD characterization of Ni-Hf alloys at low Hf concentration" in Materials Science Forum, 518 (2006):325-330,
https://doi.org/10.4028/www.scientific.net/msf.518.325 .,
https://hdl.handle.net/21.15107/rcub_vinar_6610 .

TY  - CONF
AU  - Umićević, Ana
AU  - Mahnke, Heinz-Eberhard
AU  - Cekić, Božidar Đ.
AU  - Grbović, Jasmina
AU  - Koteski, Vasil J.
AU  - Belošević-Čavor, Jelena
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12514
AB  - The alloying and phase formation in Ni-Hf samples with 0.2-, 2-, and 5-at.% Hf were studied by X-ray diffraction (XRD) technique and scanning electron microscopy (SEM). Both characterization methods, XRD and SEM, reveal the presence of the HfNi5 phase (fcc structure) where the excess Ni atoms are present in the form of Ni or Ni-rich segregations in the sample containing 5-at.% Hf. The sample with 2-at.% Hf is characterized by the presence of the two phases present in the 5-at.% sample and by Hf atoms, which occupy substitutional lattice positions in the Ni lattice. Finally, in the third sample with 0.2-at.% Hf, the Hf atoms mainly substitute the Ni atoms in the lattice. This analysis is being complemented with additional information on the local structure around Hf by extended X-ray absorption fine structure spectroscopy (EXAFS).
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - YUCOMAT 2005 : The Seventh Yugoslav Materials Research Society Conference : Programme and The Book of Abstracts
T1  - SEM and XRD characterization of Ni-Hf alloys at low Hf concentration
SP  - 29
EP  - 29
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12514
ER  - 

@conference{
author = "Umićević, Ana and Mahnke, Heinz-Eberhard and Cekić, Božidar Đ. and Grbović, Jasmina and Koteski, Vasil J. and Belošević-Čavor, Jelena",
year = "2006",
abstract = "The alloying and phase formation in Ni-Hf samples with 0.2-, 2-, and 5-at.% Hf were studied by X-ray diffraction (XRD) technique and scanning electron microscopy (SEM). Both characterization methods, XRD and SEM, reveal the presence of the HfNi5 phase (fcc structure) where the excess Ni atoms are present in the form of Ni or Ni-rich segregations in the sample containing 5-at.% Hf. The sample with 2-at.% Hf is characterized by the presence of the two phases present in the 5-at.% sample and by Hf atoms, which occupy substitutional lattice positions in the Ni lattice. Finally, in the third sample with 0.2-at.% Hf, the Hf atoms mainly substitute the Ni atoms in the lattice. This analysis is being complemented with additional information on the local structure around Hf by extended X-ray absorption fine structure spectroscopy (EXAFS).",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "YUCOMAT 2005 : The Seventh Yugoslav Materials Research Society Conference : Programme and The Book of Abstracts",
title = "SEM and XRD characterization of Ni-Hf alloys at low Hf concentration",
pages = "29-29",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12514"
}

Umićević, A., Mahnke, H., Cekić, B. Đ., Grbović, J., Koteski, V. J.,& Belošević-Čavor, J.. (2006). SEM and XRD characterization of Ni-Hf alloys at low Hf concentration. in YUCOMAT 2005 : The Seventh Yugoslav Materials Research Society Conference : Programme and The Book of Abstracts
Belgrade : Institute of Technical Sciences of SASA., 29-29.
https://hdl.handle.net/21.15107/rcub_vinar_12514

Umićević A, Mahnke H, Cekić BĐ, Grbović J, Koteski VJ, Belošević-Čavor J. SEM and XRD characterization of Ni-Hf alloys at low Hf concentration. in YUCOMAT 2005 : The Seventh Yugoslav Materials Research Society Conference : Programme and The Book of Abstracts. 2006;:29-29.
https://hdl.handle.net/21.15107/rcub_vinar_12514 .

Umićević, Ana, Mahnke, Heinz-Eberhard, Cekić, Božidar Đ., Grbović, Jasmina, Koteski, Vasil J., Belošević-Čavor, Jelena, "SEM and XRD characterization of Ni-Hf alloys at low Hf concentration" in YUCOMAT 2005 : The Seventh Yugoslav Materials Research Society Conference : Programme and The Book of Abstracts (2006):29-29,
https://hdl.handle.net/21.15107/rcub_vinar_12514 .

TY  - JOUR
AU  - Mahnke, Heinz-Eberhard
AU  - Haas, H
AU  - Holub-Krappe, E
AU  - Koteski, Vasil J.
AU  - Novaković, Nikola
AU  - Fochuk, P
AU  - Panchuk, O
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6507
AB  - We have measured the lattice distortion around As (acceptor), Se (isovalent), and Br (donor) in CdTe with fluorescence detected X-ray absorption spectroscopy (XAFS). The experimental challenge lies in the compromise between a concentration high enough for X-ray absorption and low enough to avoid compensation and clustering. We could experimentally verify the lattice relaxation with a bond length reduction of 8% around the As atom as inferred indirectly from ab initio calculations of the electric field gradient in comparison with the measured value in a Perturbed Angular Correlation (PAC) experiment as recently reported. Our calculations of relaxation were performed with the WIEN97 package using the linearised augmented plane wave (LAPW) method and the FHI96md pseudopotential (PP) program. Using a super-cell approach for As on the Te site in CdTe, we find good convergence with increasing cell size so that the result can be taken as representative for the low doping limit. The extension to the neighbouring isovalent element Se again yields perfect agreement between experiment and model calculation with a sizeable lattice mismatch. In the case of Br, we find a sizeable increase of the bond length which may be taken as evidence for the high tendency of Br to form a Br A-center (Br plus metal vacancy) in CdTe. (c) 2004 Elsevier B.V. All rights reserved.
T2  - Thin Solid Films
T1  - Lattice distortion around impurity atoms as dopants in CdTe
VL  - 480
SP  - 279
EP  - 282
DO  - 10.1016/j.tsf.2004.11.059
ER  - 

@article{
author = "Mahnke, Heinz-Eberhard and Haas, H and Holub-Krappe, E and Koteski, Vasil J. and Novaković, Nikola and Fochuk, P and Panchuk, O",
year = "2005",
abstract = "We have measured the lattice distortion around As (acceptor), Se (isovalent), and Br (donor) in CdTe with fluorescence detected X-ray absorption spectroscopy (XAFS). The experimental challenge lies in the compromise between a concentration high enough for X-ray absorption and low enough to avoid compensation and clustering. We could experimentally verify the lattice relaxation with a bond length reduction of 8% around the As atom as inferred indirectly from ab initio calculations of the electric field gradient in comparison with the measured value in a Perturbed Angular Correlation (PAC) experiment as recently reported. Our calculations of relaxation were performed with the WIEN97 package using the linearised augmented plane wave (LAPW) method and the FHI96md pseudopotential (PP) program. Using a super-cell approach for As on the Te site in CdTe, we find good convergence with increasing cell size so that the result can be taken as representative for the low doping limit. The extension to the neighbouring isovalent element Se again yields perfect agreement between experiment and model calculation with a sizeable lattice mismatch. In the case of Br, we find a sizeable increase of the bond length which may be taken as evidence for the high tendency of Br to form a Br A-center (Br plus metal vacancy) in CdTe. (c) 2004 Elsevier B.V. All rights reserved.",
journal = "Thin Solid Films",
title = "Lattice distortion around impurity atoms as dopants in CdTe",
volume = "480",
pages = "279-282",
doi = "10.1016/j.tsf.2004.11.059"
}

Mahnke, H., Haas, H., Holub-Krappe, E., Koteski, V. J., Novaković, N., Fochuk, P.,& Panchuk, O.. (2005). Lattice distortion around impurity atoms as dopants in CdTe. in Thin Solid Films, 480, 279-282.
https://doi.org/10.1016/j.tsf.2004.11.059

Mahnke H, Haas H, Holub-Krappe E, Koteski VJ, Novaković N, Fochuk P, Panchuk O. Lattice distortion around impurity atoms as dopants in CdTe. in Thin Solid Films. 2005;480:279-282.
doi:10.1016/j.tsf.2004.11.059 .

Mahnke, Heinz-Eberhard, Haas, H, Holub-Krappe, E, Koteski, Vasil J., Novaković, Nikola, Fochuk, P, Panchuk, O, "Lattice distortion around impurity atoms as dopants in CdTe" in Thin Solid Films, 480 (2005):279-282,
https://doi.org/10.1016/j.tsf.2004.11.059 . .

TY  - JOUR
AU  - Koteski, Vasil J.
AU  - Haas, H.
AU  - Holub-Krappe, E.
AU  - Ivanović, Nenad
AU  - Mahnke, Heinz-Eberhard
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2719
AB  - We have investigated the lattice relaxation around impurity atoms at the anion sublattice in CdTe, such as As acting as acceptor and Se which is isovalent to Te, with fluorescence detected EXAFS. We experimentally verify the lattice relaxation with a bond length being reduced by 8% around the As atom as inferred indirectly from ab-initio calculations of the electric field gradient in comparison with the measured value in a PAC experiment (S. Lany et al., Phys. Rev. B 62, R2259 (2000)). In the case of the isovalent impurity atom Se, the bond length is similarly reduced as determined experimentally by EXAFS and by model calculations with the density functional theory implemented in the WIEN97 program. In contrast to this inward relaxation, preliminary calculations for Br in CdTe, the next element in the series As, Se, and Br, which acts as donor at the Te sublattice, indicate an increase in bond length, an interesting prediction waiting for experimental verification.
T2  - Physica Scripta
T1  - Lattice relaxation around arsenic and selenium in CdTe
VL  - T115
SP  - 369
EP  - 371
UR  - https://hdl.handle.net/21.15107/rcub_vinar_2719
ER  - 

@article{
author = "Koteski, Vasil J. and Haas, H. and Holub-Krappe, E. and Ivanović, Nenad and Mahnke, Heinz-Eberhard",
year = "2005",
abstract = "We have investigated the lattice relaxation around impurity atoms at the anion sublattice in CdTe, such as As acting as acceptor and Se which is isovalent to Te, with fluorescence detected EXAFS. We experimentally verify the lattice relaxation with a bond length being reduced by 8% around the As atom as inferred indirectly from ab-initio calculations of the electric field gradient in comparison with the measured value in a PAC experiment (S. Lany et al., Phys. Rev. B 62, R2259 (2000)). In the case of the isovalent impurity atom Se, the bond length is similarly reduced as determined experimentally by EXAFS and by model calculations with the density functional theory implemented in the WIEN97 program. In contrast to this inward relaxation, preliminary calculations for Br in CdTe, the next element in the series As, Se, and Br, which acts as donor at the Te sublattice, indicate an increase in bond length, an interesting prediction waiting for experimental verification.",
journal = "Physica Scripta",
title = "Lattice relaxation around arsenic and selenium in CdTe",
volume = "T115",
pages = "369-371",
url = "https://hdl.handle.net/21.15107/rcub_vinar_2719"
}

Koteski, V. J., Haas, H., Holub-Krappe, E., Ivanović, N.,& Mahnke, H.. (2005). Lattice relaxation around arsenic and selenium in CdTe. in Physica Scripta, T115, 369-371.
https://hdl.handle.net/21.15107/rcub_vinar_2719

Koteski VJ, Haas H, Holub-Krappe E, Ivanović N, Mahnke H. Lattice relaxation around arsenic and selenium in CdTe. in Physica Scripta. 2005;T115:369-371.
https://hdl.handle.net/21.15107/rcub_vinar_2719 .

Koteski, Vasil J., Haas, H., Holub-Krappe, E., Ivanović, Nenad, Mahnke, Heinz-Eberhard, "Lattice relaxation around arsenic and selenium in CdTe" in Physica Scripta, T115 (2005):369-371,
https://hdl.handle.net/21.15107/rcub_vinar_2719 .

TY  - JOUR
AU  - Ivanović, Nenad
AU  - Koteski, Vasil J.
AU  - Mahnke, Heinz-Eberhard
PY  - 2004
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6421
AB  - Various models of site occupation preferences (SOPs) in multicomponent semiconducting compounds of zincblende structure type are discussed for the Cd1-xZnxTe case using our new experimental and calculated data. In order to resolve the microscopic mechanism of the phenomenon, appropriate two-body potentials and stability of all nearest neighbor (NN) tetrahedral configurations that can arise in the structure are computed using the ab-initio Linear Combination of Atomic Orbitals (LCAO) method. The obtained results are related to some known material properties and existing systematics.
T2  - Materials Science Forum
T1  - Site occupation preferences in multicomponent semiconductors: the (Cd1-xxTe)-Te-Zn case
VL  - 453-454
SP  - 93
EP  - 98
DO  - 10.4028/www.scientific.net/MSF.453-454.93
ER  - 

@article{
author = "Ivanović, Nenad and Koteski, Vasil J. and Mahnke, Heinz-Eberhard",
year = "2004",
abstract = "Various models of site occupation preferences (SOPs) in multicomponent semiconducting compounds of zincblende structure type are discussed for the Cd1-xZnxTe case using our new experimental and calculated data. In order to resolve the microscopic mechanism of the phenomenon, appropriate two-body potentials and stability of all nearest neighbor (NN) tetrahedral configurations that can arise in the structure are computed using the ab-initio Linear Combination of Atomic Orbitals (LCAO) method. The obtained results are related to some known material properties and existing systematics.",
journal = "Materials Science Forum",
title = "Site occupation preferences in multicomponent semiconductors: the (Cd1-xxTe)-Te-Zn case",
volume = "453-454",
pages = "93-98",
doi = "10.4028/www.scientific.net/MSF.453-454.93"
}

Ivanović, N., Koteski, V. J.,& Mahnke, H.. (2004). Site occupation preferences in multicomponent semiconductors: the (Cd1-xxTe)-Te-Zn case. in Materials Science Forum, 453-454, 93-98.
https://doi.org/10.4028/www.scientific.net/MSF.453-454.93

Ivanović N, Koteski VJ, Mahnke H. Site occupation preferences in multicomponent semiconductors: the (Cd1-xxTe)-Te-Zn case. in Materials Science Forum. 2004;453-454:93-98.
doi:10.4028/www.scientific.net/MSF.453-454.93 .

Ivanović, Nenad, Koteski, Vasil J., Mahnke, Heinz-Eberhard, "Site occupation preferences in multicomponent semiconductors: the (Cd1-xxTe)-Te-Zn case" in Materials Science Forum, 453-454 (2004):93-98,
https://doi.org/10.4028/www.scientific.net/MSF.453-454.93 . .

TY  - JOUR
AU  - Mahnke, Heinz-Eberhard
AU  - Haas, H
AU  - Koteski, Vasil J.
AU  - Novaković, Nikola
AU  - Fochuk, P
AU  - Panchuk, O
PY  - 2004
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6567
AB  - We have measured the lattice distortion around As (acceptor) and Br (donor) in CdTe With fluorescence detected X-ray absorption spectroscopy. We Could experimentally verify the lattice relaxation with a bond length reduction of 8% around the As atom as inferred indirectly from ab initio calculations of the electric field gradient performed with the WIEN97 package in comparison with the measured value in a Perturbed Angular Correlation experiment as recently reported. We have complemented Our own calculations of relaxation with WIEN97 with calculations using the FH196md pseudo-potential program, which allows the use of larger super-cell sizes. Encouraged by the good agreement between experiment and model calculation for As in CdTe as well as similarly for the isovalent Se in CdTe, we extended Our investigation to Br in CdTe, where the electric field gradient has also been Measured, and Could not only verify the derived lattice expansion around Br with Our EXAFS analysis but additionally observe fractions of Br in the A-center as well as in a DX-center configuration.
T2  - Hyperfine Interactions
T1  - Experimental verification of calculated lattice relaxations around impurities in CdTe
VL  - 158
IS  - 1-4
SP  - 353
EP  - 359
DO  - 10.1007/s10751-005-9053-z
ER  - 

@article{
author = "Mahnke, Heinz-Eberhard and Haas, H and Koteski, Vasil J. and Novaković, Nikola and Fochuk, P and Panchuk, O",
year = "2004",
abstract = "We have measured the lattice distortion around As (acceptor) and Br (donor) in CdTe With fluorescence detected X-ray absorption spectroscopy. We Could experimentally verify the lattice relaxation with a bond length reduction of 8% around the As atom as inferred indirectly from ab initio calculations of the electric field gradient performed with the WIEN97 package in comparison with the measured value in a Perturbed Angular Correlation experiment as recently reported. We have complemented Our own calculations of relaxation with WIEN97 with calculations using the FH196md pseudo-potential program, which allows the use of larger super-cell sizes. Encouraged by the good agreement between experiment and model calculation for As in CdTe as well as similarly for the isovalent Se in CdTe, we extended Our investigation to Br in CdTe, where the electric field gradient has also been Measured, and Could not only verify the derived lattice expansion around Br with Our EXAFS analysis but additionally observe fractions of Br in the A-center as well as in a DX-center configuration.",
journal = "Hyperfine Interactions",
title = "Experimental verification of calculated lattice relaxations around impurities in CdTe",
volume = "158",
number = "1-4",
pages = "353-359",
doi = "10.1007/s10751-005-9053-z"
}

Mahnke, H., Haas, H., Koteski, V. J., Novaković, N., Fochuk, P.,& Panchuk, O.. (2004). Experimental verification of calculated lattice relaxations around impurities in CdTe. in Hyperfine Interactions, 158(1-4), 353-359.
https://doi.org/10.1007/s10751-005-9053-z

Mahnke H, Haas H, Koteski VJ, Novaković N, Fochuk P, Panchuk O. Experimental verification of calculated lattice relaxations around impurities in CdTe. in Hyperfine Interactions. 2004;158(1-4):353-359.
doi:10.1007/s10751-005-9053-z .

Mahnke, Heinz-Eberhard, Haas, H, Koteski, Vasil J., Novaković, Nikola, Fochuk, P, Panchuk, O, "Experimental verification of calculated lattice relaxations around impurities in CdTe" in Hyperfine Interactions, 158, no. 1-4 (2004):353-359,
https://doi.org/10.1007/s10751-005-9053-z . .