Low-Temperature Phase Formation in the BaF2–LaF3 System

A. A. Alexandrov; Александров А. А.; A. G. Bragina; Брагина А. Г.; N. I. Sorokin; Сорокин Н. И.; V. V. Voronov; Воронов В. В.; A. A. Luginina; Лугинина А. А.; S. V. Kuznetsov; Кузнецов С. В.; V. K. Ivanov; Иванов В. К.; P. P. Fedorov; Федоров П. П.

doi:10.31857/S0002337X23030016

Low-Temperature Phase Formation in the BaF2–LaF3 System

Authors: Alexandrov A.A.¹^,2, Bragina A.G.¹, Sorokin N.I.³, Voronov V.V.¹, Luginina A.A.¹, Kuznetsov S.V.¹, Ivanov V.K.², Fedorov P.P.¹
Affiliations:
1. Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991, Moscow, Russia
2. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 119991, Moscow, Russia
3. Shubnikov Institute of Crystallography, Crystallography and Photonics Federal Research Center of the Russian Academy of Sciences, 119333, Moscow, Russia
Issue: Vol 59, No 3 (2023)
Pages: 306-316
Section: Articles
URL: https://medjrf.com/0002-337X/article/view/668314
DOI: https://doi.org/10.31857/S0002337X23030016
EDN: https://elibrary.ru/YQIUKH
ID: 668314

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Abstract
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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.

Keywords

barium fluoride, lanthanum fluoride, fluorite, hydrolysis, molten salt synthesis, sodium nitrate, ionic conductivity

References

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