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Thermal and electrical properties of Ca5Mg4−xZnx(VO4)6 (0 ≤ x ≤ 4)

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Abstract

Calcium vanadates Ca5Mg4−xZnx(VO4)6 (0 ≤ x ≤ 4) have been studied for the first time using a set of high-temperature methods of analysis. The onset of melting process determined from differential scanning calorimetry decreases from 1158 to 881 °C (± 1.5 °C) with increasing of x (dopant’s content). CTE temperature dependence is found to show a hysteresis. Electrical transport properties measured by impedance spectroscopy in air of different humidity are also discussed. The value of electrical conductivity does not depend on air humidity. It is found to equal to 1.5 × 10−6 S cm−1 at 720 °C for Ca5Mg4(VO4)6 which is specific for garnet-related crystals.

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Acknowledgements

The reported study was funded by the RFBR according to the research Project No. 17–03–01280. Powder diffraction experiments were carried out in the Shared Access Centre at the IHTE UB RAS.

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Authors and Affiliations

  1. Institute of High-Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences, 20, Akademicheskaya, Ekaterinburg, Russia, 620137

    Anna S. Tolkacheva, Sergey N. Shkerin & Svetlana V. Pershina

  2. INMT Ural Federal University, Ekaterinburg, Russia, 620002

    Anna S. Tolkacheva, Kirill G. Zemlyanoi & Pavel D. Khavlyuk

  3. Institute of Solid State Chemistry, Ural Branch of Russian Academy of Sciences, Ekaterinburg, Russia, 620990

    Olga G. Reznitskikh

  4. Inenergy Llc, Second Kotlyakovskiy Lane, 18, Moscow, Russia, 115201

    Olga G. Reznitskikh

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  1. Anna S. Tolkacheva
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  2. Sergey N. Shkerin
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  3. Kirill G. Zemlyanoi
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  4. Olga G. Reznitskikh
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  5. Svetlana V. Pershina
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  6. Pavel D. Khavlyuk
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Correspondence to Anna S. Tolkacheva.

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Tolkacheva, A.S., Shkerin, S.N., Zemlyanoi, K.G. et al. Thermal and electrical properties of Ca5Mg4−xZnx(VO4)6 (0 ≤ x ≤ 4). J Therm Anal Calorim 136, 1003–1009 (2019). https://doi.org/10.1007/s10973-018-7780-z

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  • DOI: https://doi.org/10.1007/s10973-018-7780-z

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