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

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Abstract

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.

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ACKNOWLEDGMENTS

Equipment of the Ural-M Shared Facilities Center of the Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences was used in the X-ray structural experiments. The Raman spectra were measured in the Geoanalyst Shared Facilities Center of the Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences.

Funding

This work was fulfilled as part of the Government task to the Institute of Geology and Geochemistry (theme No. AAAA-A19-119071090011-6). The retrofit and development of the Geoanalitik Shared Facilities Center of the Institute of Geology and Geochemistry is carried out under a grant from the Ministry of Higher Education and Science of the Russian Federation (agreement No. 075-15-2021-680).

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Authors and Affiliations

  1. Eltsin Ural Federal University, Institute of Natural Sciences and Mathematics, 620000, Yekaterinburg, Russia

    O. S. Kaimieva, Z. A. Mikhailovskaya & E. S. Buyanova

  2. Zavaritskii Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences, 620110, Yekaterinburg, Russia

    Z. A. Mikhailovskaya & E. A. Pankrushina

  3. Institute of Metallurgy, Ural Branch, Russian Academy of Sciences, 620016, Yekaterinburg, Russia

    S. A. Petrova

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  1. O. S. Kaimieva
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  2. Z. A. Mikhailovskaya
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Correspondence to O. S. Kaimieva.

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Translated by O. Fedorova

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Kaimieva, O.S., Mikhailovskaya, Z.A., Buyanova, E.S. et al. Structure and Electrical Conductivity of Bismuth- and Germanium-Doped Calcium Molybdates. Russ. J. Inorg. Chem. 68, 386–395 (2023). https://doi.org/10.1134/S0036023623600235

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  • DOI: https://doi.org/10.1134/S0036023623600235

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