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.
TY - JOUR
AU - Poleti, Dejan
AU - Karanović, Ljiljana
AU - Zdujić, Miodrag
AU - Jovalekić, Čedomir
PY - 2012
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
SP - 1091
EP - 1096
VL - 77
IS - 8
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 = "1091-1096",
volume = "77",
number = "8",
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.
Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 77(8), 1091-1096.
https://doi.org/10.2298/JSC110914215P
Poleti D, Karanović L, Zdujić M, Jovalekić Č. Phase composition of Bi2O3 specimens doped with Ti, Zr and Hf. Journal of the Serbian Chemical Society. 2012;77(8):1091-1096.
doi:10.2298/JSC110914215P.
Poleti Dejan, Karanović Ljiljana, Zdujić Miodrag, Jovalekić Čedomir, "Phase composition of Bi2O3 specimens doped with Ti, Zr and Hf" Journal of the Serbian Chemical Society, 77, no. 8 (2012):1091-1096,
https://doi.org/10.2298/JSC110914215P .
