Proton Conductivity in Rare-Earth Fluorine-Containing Molybdates NaLn4Mo3O15F

E. D. Baldin; Балдин Е. Д.; T. A. Sorokin; Сорокин Т. А.; E. I. Orlova; Орлова Е. И.; N. V. Gorshkov; Горшков Н. В.; E. P. Kharitonova; Харитонова Е. П.; N. V. Lyskov; Лысков Н. В.; V. G. Goffman; Гоффман В. Г.; V. I. Voronkova; Воронкова В. И.

doi:10.31857/S0424857023010164

Proton Conductivity in Rare-Earth Fluorine-Containing Molybdates NaLn4Mo3O15F

Autores: Baldin E.D.¹, Sorokin T.A.², Orlova E.I.³, Gorshkov N.V.⁴, Kharitonova E.P.³, Lyskov N.V.⁵, Goffman V.G.⁴, Voronkova V.I.³
Afiliações:
1. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
2. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Federal Research Center “Crystallography and Photonics”
3. Faculty of Physics, Moscow State University
4. Yuri Gagarin State Technical University of Sarato
5. Institute of Problems of Chemical Physics, Russian Academy of Sciences
Edição: Volume 59, Nº 1 (2023)
Páginas: 61-67
Seção: Articles
URL: https://cardiosomatics.ru/0424-8570/article/view/671171
DOI: https://doi.org/10.31857/S0424857023010164
EDN: https://elibrary.ru/JXBNXH
ID: 671171

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Resumo

The fluorine-containing fluorite-like compounds of composition NaLn4Mo3O15F (Ln = La, Pr, Nd) are produced using the method of solid-phase synthesis in air. Their thermomechanical and conducting properties, as well as hygroscopicity, are studied. It is confirmed that the synthesized specimens are isostructural to the cubic compounds Ln5Mo3O16 with the fluorite-like structure. It is shown that in the temperature range of 20–600°C, the specimens of NaLn4Mo3O15F (Ln = La, Pr, Nd) expand linearly, and their thermal expansion coefficients (13–14) × 10–6 K–1 are close to the coefficients of conventional SOFC electrolytes, for example, YSZ. Using the thermal gravimetric analysis, it is shown that the weight loss of the studied specimens in the range from 30 to 700°C is caused by their hygroscopicity. The electrophysical properties of the compounds are studied using the method of impedance spectroscopy in the humid atmosphere, and the proton component of conductivity is revealed.

Palavras-chave

rare-earth molybdates, fluorine-containing molybdates, oxygen conductivity, proton conductivity, hygroscopicity, thermal expansion coefficient, solid oxide fuel cells

Bibliografia

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