Structure and Electrical Conductivity of Bismuth- and Germanium-Doped Calcium Molybdates

O. S. Kaimieva; Каймиева О. С.; Z. A. Mikhailovskaya; Михайловская З. А.; E. S. Buyanova; Буянова Е. С.; S. A. Petrova; Петрова С. А.; E. A. Pankrushina; Панкрушина Е. А.

doi:10.31857/S0044457X22602048

Structure and Electrical Conductivity of Bismuth- and Germanium-Doped Calcium Molybdates

作者: Kaimieva O.S.¹, Mikhailovskaya Z.A.¹^,2, Buyanova E.S.¹, Petrova S.A.³, Pankrushina E.A.²
隶属关系:
1. Eltsin Ural Federal University, Institute of Natural Sciences and Mathematics
2. Zavaritskii Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences
3. Institute of Metallurgy, Ural Branch, Russian Academy of Sciences
期: 卷 68, 编号 4 (2023)
页面: 452-462
栏目: СИНТЕЗ И СВОЙСТВА НЕОРГАНИЧЕСКИХ СОЕДИНЕНИЙ
URL: https://vietnamjournal.ru/0044-457X/article/view/665267
DOI: https://doi.org/10.31857/S0044457X22602048
EDN: https://elibrary.ru/FMYDUZ
ID: 665267

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详细

Ca1 – 2xBi2xMo1 – xGexO4 solid solutions with a scheelite-like structure (space group I41/a) and the homogeneity range х = 0.0–0.4 were prepared using standard ceramic technology. The unit cell parameter с and unit cell volume increase as the dopant concentration increases due to the changing size of Ca/BiO8 polyhedra. The predominant thermal expansion of Ca/BiO8 polyhedra was inferred from the temperature-dependent unit cell parameters and Raman spectral patterns. The Ca/Bi–O and Mo/Ge–O bond lengths were calculated. The increasing dopant concentration decreases the thermal expansion coefficient of the ceramics and increases the electrical conductivity and activation energy of the complex oxides compared to the matrix compound. The effective oxygen diffusion coefficient is determined.

关键词

synthesis, scheelite, high-temperature X-ray diffraction analysis, tensor, thermal expansion

参考

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