TY  - JOUR
AU  - Karanović, Ljiljana
AU  - Poleti, Dejan
AU  - Đorđević, Tamara
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5772
AB  - A new organic-inorganic hybrid compound, catena-poly[bis(1-ethyl-3-methylimidazolium) [μ5-bromido-tri-μ3-bromido-tri-μ2-bromido-pentacuprate(I)]], {(C6H11N2)2[Cu5Br7]}n , has been obtained under ionothermal conditions from a reaction mixture containing Ba(OH)2.8H2O, Cu(OH)2.2H2O, As2O5, 1-ethyl-3-methylimidazolium bromide and distilled water. The crystal structure consists of complex [Cu5Br7]2- anions arranged in sinusoidal {[Cu5Br7]2-}n chains running along the a axis, which are surrounded by 1-ethyl-3-methylimidazolium cations. Three of the five unique Br atoms and one of the three CuI atoms occupy special positions with half-occupancy (a mirror plane perpendicular to the b axis, site symmetry m). The CuI ions are in a distorted tetrahedral coordination environment, with four Br atoms at distances ranging from 2.3667 14;(10) to 2.6197 14;(13) 14;Å, and an outlier at 3.0283 14;(12) 14;Å, exceptionally elongated and with a small contribution to the bond-valence sum of only 6.7%. Short C-H⋯Br contacts build up a three-dimensional network. The Cu⋯Cu distances within the chain range from 2.8390 14;(12) to 3.0805 14;(17) 14;Å, indicating the existence of weak CuI⋯CuI cuprophilic interactions.
PB  - International Union of Crystallography
T2  - Acta Crystallographica Section C: Structural Chemistry
T1  - Ionothermal synthesis and crystal structure of a new organic-inorganic hybrid compound: Catena-poly[bis(1-ethyl-3-methylimidazolium) [hepta-μ-bromido-pentacuprate(I)]]
EP  - 1024
SP  - 1021
VL  - 70
DO  - 10.1107/S205322961402172X
ER  - 

@article{
author = "Karanović, Ljiljana and Poleti, Dejan and Đorđević, Tamara",
year = "2014",
abstract = "A new organic-inorganic hybrid compound, catena-poly[bis(1-ethyl-3-methylimidazolium) [μ5-bromido-tri-μ3-bromido-tri-μ2-bromido-pentacuprate(I)]], {(C6H11N2)2[Cu5Br7]}n , has been obtained under ionothermal conditions from a reaction mixture containing Ba(OH)2.8H2O, Cu(OH)2.2H2O, As2O5, 1-ethyl-3-methylimidazolium bromide and distilled water. The crystal structure consists of complex [Cu5Br7]2- anions arranged in sinusoidal {[Cu5Br7]2-}n chains running along the a axis, which are surrounded by 1-ethyl-3-methylimidazolium cations. Three of the five unique Br atoms and one of the three CuI atoms occupy special positions with half-occupancy (a mirror plane perpendicular to the b axis, site symmetry m). The CuI ions are in a distorted tetrahedral coordination environment, with four Br atoms at distances ranging from 2.3667 14;(10) to 2.6197 14;(13) 14;Å, and an outlier at 3.0283 14;(12) 14;Å, exceptionally elongated and with a small contribution to the bond-valence sum of only 6.7%. Short C-H⋯Br contacts build up a three-dimensional network. The Cu⋯Cu distances within the chain range from 2.8390 14;(12) to 3.0805 14;(17) 14;Å, indicating the existence of weak CuI⋯CuI cuprophilic interactions.",
publisher = "International Union of Crystallography",
journal = "Acta Crystallographica Section C: Structural Chemistry",
title = "Ionothermal synthesis and crystal structure of a new organic-inorganic hybrid compound: Catena-poly[bis(1-ethyl-3-methylimidazolium) [hepta-μ-bromido-pentacuprate(I)]]",
pages = "1024-1021",
volume = "70",
doi = "10.1107/S205322961402172X"
}

Karanović, L., Poleti, D.,& Đorđević, T.. (2014). Ionothermal synthesis and crystal structure of a new organic-inorganic hybrid compound: Catena-poly[bis(1-ethyl-3-methylimidazolium) [hepta-μ-bromido-pentacuprate(I)]]. in Acta Crystallographica Section C: Structural Chemistry
International Union of Crystallography., 70, 1021-1024.
https://doi.org/10.1107/S205322961402172X

Karanović L, Poleti D, Đorđević T. Ionothermal synthesis and crystal structure of a new organic-inorganic hybrid compound: Catena-poly[bis(1-ethyl-3-methylimidazolium) [hepta-μ-bromido-pentacuprate(I)]]. in Acta Crystallographica Section C: Structural Chemistry. 2014;70:1021-1024.
doi:10.1107/S205322961402172X .

Karanović, Ljiljana, Poleti, Dejan, Đorđević, Tamara, "Ionothermal synthesis and crystal structure of a new organic-inorganic hybrid compound: Catena-poly[bis(1-ethyl-3-methylimidazolium) [hepta-μ-bromido-pentacuprate(I)]]" in Acta Crystallographica Section C: Structural Chemistry, 70 (2014):1021-1024,
https://doi.org/10.1107/S205322961402172X . .

TY  - JOUR
AU  - Poleti, Dejan
AU  - Karanović, Ljiljana
AU  - Zdujić, Miodrag
AU  - Jovalekić, Čedomir
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5720
AB  - Powder mixtures of α-Bi2O3 containing 2, 5 and 10 mole % of TiO2, ZrO2 or HfO2 were homogenized, heated at 820ºC for 24 h and quenched in air. X-ray powder diffraction technique was used to characterize the prepared samples. In all cases metastable Bi2O3 polymorphs, γ-Bi2O3 or β-Bi2O3, are found as single or major phases. Addition of Ti4+ ions stabilizes γ-Bi2O3 polymorph, while either Zr4+ or Hf4+ ions stabilize β-Bi2O3 polymorph. In the samples with 2 and 5 mole % of TiO2 the presence of even two γ-Bi2O3 phases (Bi12TiO20 compound and a very low Ti-doped γ-Bi2O3) was established. Similarly, in the sample with 2 mole % of HfO2 two β-Bi2O3 phases were found. Phase composition of prepared samples, values of unit cell parameters and the appearance of two polymorphs with identical crystal structure but different unit cell parameters are discussed and compared with known data.
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Phase composition of Bi2O3 specimens doped with Ti, Zr and Hf
EP  - 1096
IS  - 8
SP  - 1091
VL  - 77
DO  - 10.2298/JSC110914215P
UR  - https://hdl.handle.net/21.15107/rcub_dais_270
ER  - 

@article{
author = "Poleti, Dejan and Karanović, Ljiljana and Zdujić, Miodrag and Jovalekić, Čedomir",
year = "2012",
abstract = "Powder mixtures of α-Bi2O3 containing 2, 5 and 10 mole % of TiO2, ZrO2 or HfO2 were homogenized, heated at 820ºC for 24 h and quenched in air. X-ray powder diffraction technique was used to characterize the prepared samples. In all cases metastable Bi2O3 polymorphs, γ-Bi2O3 or β-Bi2O3, are found as single or major phases. Addition of Ti4+ ions stabilizes γ-Bi2O3 polymorph, while either Zr4+ or Hf4+ ions stabilize β-Bi2O3 polymorph. In the samples with 2 and 5 mole % of TiO2 the presence of even two γ-Bi2O3 phases (Bi12TiO20 compound and a very low Ti-doped γ-Bi2O3) was established. Similarly, in the sample with 2 mole % of HfO2 two β-Bi2O3 phases were found. Phase composition of prepared samples, values of unit cell parameters and the appearance of two polymorphs with identical crystal structure but different unit cell parameters are discussed and compared with known data.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Phase composition of Bi2O3 specimens doped with Ti, Zr and Hf",
pages = "1096-1091",
number = "8",
volume = "77",
doi = "10.2298/JSC110914215P",
url = "https://hdl.handle.net/21.15107/rcub_dais_270"
}

Poleti, D., Karanović, L., Zdujić, M.,& Jovalekić, Č.. (2012). Phase composition of Bi2O3 specimens doped with Ti, Zr and Hf. in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 77(8), 1091-1096.
https://doi.org/10.2298/JSC110914215P
https://hdl.handle.net/21.15107/rcub_dais_270

Poleti D, Karanović L, Zdujić M, Jovalekić Č. Phase composition of Bi2O3 specimens doped with Ti, Zr and Hf. in Journal of the Serbian Chemical Society. 2012;77(8):1091-1096.
doi:10.2298/JSC110914215P
https://hdl.handle.net/21.15107/rcub_dais_270 .

Poleti, Dejan, Karanović, Ljiljana, Zdujić, Miodrag, Jovalekić, Čedomir, "Phase composition of Bi2O3 specimens doped with Ti, Zr and Hf" in Journal of the Serbian Chemical Society, 77, no. 8 (2012):1091-1096,
https://doi.org/10.2298/JSC110914215P .,
https://hdl.handle.net/21.15107/rcub_dais_270 .

TY  - JOUR
AU  - Veljković, Ivana
AU  - Poleti, Dejan
AU  - Karanović, Ljiljana
AU  - Zdujić, Miodrag
AU  - Branković, Goran
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5656
AB  - Extra phase-pure Li4Ti5O12 spinel with particle sizes less than 500 nm was synthesized by solid state reaction of mechanochemicaly activated mixture of nano anatase and Li2CO3 for a very short annealing time, 4 h at 800°C. Structural and microstructural properties, the mechanism of solid state reaction between anatase and Li2CO3 as well as thermal stability of prepared spinel were investigated using XRPD, SEM and TG/DSC analysis. The mechanism of reaction implies decomposition of Li2CO3 below 250ºC, formation of monoclinic Li2TiO3 as intermediate product between 400 and 600°C and its transformation to Li4Ti5O12 between 600-800ºC. The spinel structure is stable up to 1000ºC when it is decomposed due to Li2O evaporation.
PB  - Belgrade : International Institute for the Science of Sintering
T2  - Science of Sintering
T1  - Solid state synthesis of extra phase-pure Li4Ti5O12 spinel
EP  - 351
IS  - 3
SP  - 343
VL  - 43
DO  - 10.2298/SOS1103343V
UR  - https://hdl.handle.net/21.15107/rcub_dais_199
ER  - 

@article{
author = "Veljković, Ivana and Poleti, Dejan and Karanović, Ljiljana and Zdujić, Miodrag and Branković, Goran",
year = "2011",
abstract = "Extra phase-pure Li4Ti5O12 spinel with particle sizes less than 500 nm was synthesized by solid state reaction of mechanochemicaly activated mixture of nano anatase and Li2CO3 for a very short annealing time, 4 h at 800°C. Structural and microstructural properties, the mechanism of solid state reaction between anatase and Li2CO3 as well as thermal stability of prepared spinel were investigated using XRPD, SEM and TG/DSC analysis. The mechanism of reaction implies decomposition of Li2CO3 below 250ºC, formation of monoclinic Li2TiO3 as intermediate product between 400 and 600°C and its transformation to Li4Ti5O12 between 600-800ºC. The spinel structure is stable up to 1000ºC when it is decomposed due to Li2O evaporation.",
publisher = "Belgrade : International Institute for the Science of Sintering",
journal = "Science of Sintering",
title = "Solid state synthesis of extra phase-pure Li4Ti5O12 spinel",
pages = "351-343",
number = "3",
volume = "43",
doi = "10.2298/SOS1103343V",
url = "https://hdl.handle.net/21.15107/rcub_dais_199"
}

Veljković, I., Poleti, D., Karanović, L., Zdujić, M.,& Branković, G.. (2011). Solid state synthesis of extra phase-pure Li4Ti5O12 spinel. in Science of Sintering
Belgrade : International Institute for the Science of Sintering., 43(3), 343-351.
https://doi.org/10.2298/SOS1103343V
https://hdl.handle.net/21.15107/rcub_dais_199

Veljković I, Poleti D, Karanović L, Zdujić M, Branković G. Solid state synthesis of extra phase-pure Li4Ti5O12 spinel. in Science of Sintering. 2011;43(3):343-351.
doi:10.2298/SOS1103343V
https://hdl.handle.net/21.15107/rcub_dais_199 .

Veljković, Ivana, Poleti, Dejan, Karanović, Ljiljana, Zdujić, Miodrag, Branković, Goran, "Solid state synthesis of extra phase-pure Li4Ti5O12 spinel" in Science of Sintering, 43, no. 3 (2011):343-351,
https://doi.org/10.2298/SOS1103343V .,
https://hdl.handle.net/21.15107/rcub_dais_199 .

TY  - JOUR
AU  - Veljković, Ivana
AU  - Poleti, Dejan
AU  - Zdujić, Miodrag
AU  - Karanović, Ljiljana
AU  - Jovalekić, Čedomir
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5567
AB  - Nanocrystalline cubic titanium monoxide, TiOx (0.92 < x < 1.19), with mean crystallite size of ≈ 6 nm, was synthesized by mechanochemical treatment of Ti and TiO2 (rutile) powder mixtures with molar ratios of 1:1, 1.10:1 and 1.25:1. The mechanochemical solid state reaction in a high-energy planetary ball mill was completed for 2 h in either air or argon atmosphere. During heating in vacuum at 900 and 1000 °C for 24 h, nanocrystalline TiOx transforms to a well-crystallized, cubic or monoclinic TiOx. The materials prepared were characterized by XRPD, TGA/DSC and SEM/EDS analysis. © 2008 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Materials Letters
T1  - Mechanochemical synthesis of nanocrystalline titanium monoxide
EP  - 2771
IS  - 17-18
SP  - 2769
VL  - 62
DO  - 10.1016/j.matlet.2008.01.039
UR  - https://hdl.handle.net/21.15107/rcub_dais_3580
ER  - 

@article{
author = "Veljković, Ivana and Poleti, Dejan and Zdujić, Miodrag and Karanović, Ljiljana and Jovalekić, Čedomir",
year = "2008",
abstract = "Nanocrystalline cubic titanium monoxide, TiOx (0.92 < x < 1.19), with mean crystallite size of ≈ 6 nm, was synthesized by mechanochemical treatment of Ti and TiO2 (rutile) powder mixtures with molar ratios of 1:1, 1.10:1 and 1.25:1. The mechanochemical solid state reaction in a high-energy planetary ball mill was completed for 2 h in either air or argon atmosphere. During heating in vacuum at 900 and 1000 °C for 24 h, nanocrystalline TiOx transforms to a well-crystallized, cubic or monoclinic TiOx. The materials prepared were characterized by XRPD, TGA/DSC and SEM/EDS analysis. © 2008 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Materials Letters",
title = "Mechanochemical synthesis of nanocrystalline titanium monoxide",
pages = "2771-2769",
number = "17-18",
volume = "62",
doi = "10.1016/j.matlet.2008.01.039",
url = "https://hdl.handle.net/21.15107/rcub_dais_3580"
}

Veljković, I., Poleti, D., Zdujić, M., Karanović, L.,& Jovalekić, Č.. (2008). Mechanochemical synthesis of nanocrystalline titanium monoxide. in Materials Letters
Elsevier., 62(17-18), 2769-2771.
https://doi.org/10.1016/j.matlet.2008.01.039
https://hdl.handle.net/21.15107/rcub_dais_3580

Veljković I, Poleti D, Zdujić M, Karanović L, Jovalekić Č. Mechanochemical synthesis of nanocrystalline titanium monoxide. in Materials Letters. 2008;62(17-18):2769-2771.
doi:10.1016/j.matlet.2008.01.039
https://hdl.handle.net/21.15107/rcub_dais_3580 .

Veljković, Ivana, Poleti, Dejan, Zdujić, Miodrag, Karanović, Ljiljana, Jovalekić, Čedomir, "Mechanochemical synthesis of nanocrystalline titanium monoxide" in Materials Letters, 62, no. 17-18 (2008):2769-2771,
https://doi.org/10.1016/j.matlet.2008.01.039 .,
https://hdl.handle.net/21.15107/rcub_dais_3580 .

TY  - JOUR
AU  - Jovalekić, Čedomir
AU  - Zdujić, Miodrag
AU  - Poleti, Dejan
AU  - Karanović, Ljiljana
AU  - Mitrić, Miodrag
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5578
AB  - Powder mixtures of α-Bi2O3 (bismite) and monoclinic m-ZrO2 (baddeleyite) in the molar ratio 2:3 were mechanochemically and thermally treated with the goal to examine the phases, which may appear during such procedures. The prepared samples were characterized by X-ray powder diffraction, differential scanning calorimetry (DSC), electrical measurements, as well as scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The mechanochemical reaction leads to the gradual formation of a nanocrystalline phase, which resembles δ-Bi2O3, a high-temperature Bi2O3 polymorph. Isothermal sintering in air at a temperature of 820 °C for 24 h followed by quenching to room temperature yielded a mixture of ZrO2-stabilized β-Bi2O3 and m-ZrO2 phases, whereas in slowly cooled products, the complete separation of the initial α-Bi2O3 and m-ZrO2 constituents was observed. The dielectric permittivity of the sintered samples significantly depended on the temperature. The sintered and quenched samples exhibited a hysteresis dependence of the dielectric shift, showing that the ZrO2-doped β-Bi2O3 phase possess ferroelectric properties, which were detected for the first time. This fact, together with Rietveld refinement of the β-Bi2O3/m-ZrO2 mixture based on neutron powder diffraction data showed that ZrO2-doped β-Bi2O3 has a non-centrosymmetric structure with P over(4, -) 21 c as the true space group. The ZrO2 content in the doped β-Bi2O3 and the crystal chemical reasons for the stabilization of the β-Bi2O3 phase by the addition of m-ZrO2 are discussed. © 2008 Elsevier Inc. All rights reserved.
T2  - Journal of Solid State Chemistry
T1  - Structural and electrical properties of the 2Bi2O3·3ZrO2 system
EP  - 1329
IS  - 6
SP  - 1321
VL  - 181
DO  - 10.1016/j.jssc.2008.02.038
UR  - https://hdl.handle.net/21.15107/rcub_dais_3582
ER  - 

@article{
author = "Jovalekić, Čedomir and Zdujić, Miodrag and Poleti, Dejan and Karanović, Ljiljana and Mitrić, Miodrag",
year = "2008",
abstract = "Powder mixtures of α-Bi2O3 (bismite) and monoclinic m-ZrO2 (baddeleyite) in the molar ratio 2:3 were mechanochemically and thermally treated with the goal to examine the phases, which may appear during such procedures. The prepared samples were characterized by X-ray powder diffraction, differential scanning calorimetry (DSC), electrical measurements, as well as scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The mechanochemical reaction leads to the gradual formation of a nanocrystalline phase, which resembles δ-Bi2O3, a high-temperature Bi2O3 polymorph. Isothermal sintering in air at a temperature of 820 °C for 24 h followed by quenching to room temperature yielded a mixture of ZrO2-stabilized β-Bi2O3 and m-ZrO2 phases, whereas in slowly cooled products, the complete separation of the initial α-Bi2O3 and m-ZrO2 constituents was observed. The dielectric permittivity of the sintered samples significantly depended on the temperature. The sintered and quenched samples exhibited a hysteresis dependence of the dielectric shift, showing that the ZrO2-doped β-Bi2O3 phase possess ferroelectric properties, which were detected for the first time. This fact, together with Rietveld refinement of the β-Bi2O3/m-ZrO2 mixture based on neutron powder diffraction data showed that ZrO2-doped β-Bi2O3 has a non-centrosymmetric structure with P over(4, -) 21 c as the true space group. The ZrO2 content in the doped β-Bi2O3 and the crystal chemical reasons for the stabilization of the β-Bi2O3 phase by the addition of m-ZrO2 are discussed. © 2008 Elsevier Inc. All rights reserved.",
journal = "Journal of Solid State Chemistry",
title = "Structural and electrical properties of the 2Bi2O3·3ZrO2 system",
pages = "1329-1321",
number = "6",
volume = "181",
doi = "10.1016/j.jssc.2008.02.038",
url = "https://hdl.handle.net/21.15107/rcub_dais_3582"
}

Jovalekić, Č., Zdujić, M., Poleti, D., Karanović, L.,& Mitrić, M.. (2008). Structural and electrical properties of the 2Bi2O3·3ZrO2 system. in Journal of Solid State Chemistry, 181(6), 1321-1329.
https://doi.org/10.1016/j.jssc.2008.02.038
https://hdl.handle.net/21.15107/rcub_dais_3582

Jovalekić Č, Zdujić M, Poleti D, Karanović L, Mitrić M. Structural and electrical properties of the 2Bi2O3·3ZrO2 system. in Journal of Solid State Chemistry. 2008;181(6):1321-1329.
doi:10.1016/j.jssc.2008.02.038
https://hdl.handle.net/21.15107/rcub_dais_3582 .

Jovalekić, Čedomir, Zdujić, Miodrag, Poleti, Dejan, Karanović, Ljiljana, Mitrić, Miodrag, "Structural and electrical properties of the 2Bi2O3·3ZrO2 system" in Journal of Solid State Chemistry, 181, no. 6 (2008):1321-1329,
https://doi.org/10.1016/j.jssc.2008.02.038 .,
https://hdl.handle.net/21.15107/rcub_dais_3582 .