Ternary cesium(rubidium) tungstates: production and impedance spectroscopy
https://doi.org/10.21285/achb.910
EDN: YBFJXA
Abstract
The work is aimed at the directed synthesis of new phases of tungstates containing mono-, tri-, and tetravalent metals, as well as the determination of their crystallographic, thermal, and electrophysical properties.
The study used the method of solid-phase synthesis to obtain tungstate phases with composition MRA0.5(WO4)3 (M – singly, R – triply-, and A – tetra-charged elements) within the temperature range of 400–750 °С. Their crystallographic and thermal characteristics were determined. The synthesized ternary tungstates crystallizing in a hexagonal system were studied using differential scanning calorimetry. The technique revealed an increase in the melting temperatures of compounds with increasing ionic radius of the trivalent cation in the series CsRTi0.5(WO4)3 (R = Al, Cr, Ga, Fe, In). The same correlation is observed when switching from rubidium to cesium derivatives. The thermal stability of ternary titanium and hafnium tungstates was compared. The melting temperatures of RbRTi0.5(WO4)3 are about 20 °С higher than those of their hafnium counterparts. The dielectric characteristics of CsRTi0.5(WO4)3 (R = Fe, Cr) belonging to the ternary tungstate family were analyzed via impedance spectroscopy. The temperature and frequency dependences of the conductivity of ternary tungstates at different frequencies (1 Hz – 1 mHz), measured in heating and cooling modes, are characterized by a slight temperature hysteresis, reaching 10-2–10-3 S/cm in the high-temperature region at activation energy values of 0.4–0.5 eV. The impedance frequency spectra measured within the range of 1 Hz – 1 mHz at different temperatures confirm the ion-conducting properties of the sample, which allows the obtained phases to be considered promising solid electrolytes.
Keywords
Supporting agencies: The work was carried out within the framework of the state task of the Baikal Institute of Nature Management SB RAS (no. 0273-2021-0008)
About the Authors
S. G. Dorzhieva
Baikal Institute of Nature Management SB RAS
Russian Federation
Russian Federation
Sesegma G. Dorzhieva, Cand. Sci. (Chemistry), Senior Researcher
670047; 6, Sakhyanova St.; Ulan-Ude
J. G. Bazarova
Baikal Institute of Nature Management SB RAS
Russian Federation
Russian Federation
Jibzema G. Bazarova, Dr. Sci. (Chemistry), Professor, Chief Researcher
670047; 6, Sakhyanova St.; Ulan-Ude
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Review
For citations:
Dorzhieva S.G., Bazarova J.G. Ternary cesium(rubidium) tungstates: production and impedance spectroscopy. Proceedings of Universities. Applied Chemistry and Biotechnology. 2024;14(2):166-172. (In Russ.) https://doi.org/10.21285/achb.910. EDN: YBFJXA
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