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Low-Temperature Phase Formation in the BaF2–LaF3 System

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Inorganic Materials Aims and scope

Abstract—

Barium lanthanum fluoride powders have been prepared by reacting barium nitrate and lanthanum nitrate in molten sodium nitrate at 350 and 450°C, using a sodium fluoride as a fluorinating agent. A fivefold excess of sodium fluoride has been shown to prevent pyrohydrolysis. We have identified a phase of variable composition with the fluorite structure, Ba1–xLaxF2+x (0.3 < x < 0.5), which has high ionic conductivity (2.3 × 10–4 S/cm at 500 K) and an activation enthalpy for ionic transport of 0.50 ± 0.01 eV.

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ACKNOWLEDGMENTS

In this study, we used equipment at the Shared Research Facilities Center, Prokhorov General Physics Institute of the Russian Academy of Sciences; the Shared Physical Characterization Facilities Center, Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences; and the Crystallography and Photonics Federal Research Center of the Russian Academy of Sciences.

Funding

This work was supported by the Russian Science Foundation, grant no. 22-13-00167. https://rscf.ru/project/22-13-00167/.

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Authors and Affiliations

  1. Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991, Moscow, Russia

    A. A. Alexandrov, A. G. Bragina, V. V. Voronov, A. A. Luginina, S. V. Kuznetsov & P. P. Fedorov

  2. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 119991, Moscow, Russia

    A. A. Alexandrov & V. K. Ivanov

  3. Shubnikov Institute of Crystallography, Crystallography and Photonics Federal Research Center of the Russian Academy of Sciences, 119333, Moscow, Russia

    N. I. Sorokin

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  1. A. A. Alexandrov
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  2. A. G. Bragina
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Correspondence to P. P. Fedorov.

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Alexandrov, A.A., Bragina, A.G., Sorokin, N.I. et al. Low-Temperature Phase Formation in the BaF2–LaF3 System. Inorg Mater 59, 295–305 (2023). https://doi.org/10.1134/S0020168523030019

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