Proton Conductivity in Rare-Earth Fluorine-Containing Molybdates NaLn4Mo3O15F

被引：8

作者：

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
]}

机构：

[1] Russian Acad Sci, Semenov Fed Res Ctr Chem Phys, Moscow, Russia

[2] Russian Acad Sci, Shubnikov Inst Crystallog, Fed Res Ctr Crystallog & Photon, Moscow, Russia

[3] Moscow MV Lomonosov State Univ, Fac Phys, Moscow, Russia

[4] Yuri Gagarin State Tech Univ Saratov, Saratov, Russia

[5] Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka, Russia

来源：

RUSSIAN JOURNAL OF ELECTROCHEMISTRY | 2023年 / 59卷 / 01期

关键词：

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

D O I：

10.1134/S1023193523010032

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The fluorine-containing fluorite-like compounds of composition NaLn(4)Mo(3)O(15)F (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 Ln(5)Mo(3)O(16) with the fluorite-like structure. It is shown that in the temperature range of 20-600 degrees C, the specimens of NaLn(4)Mo(3)O(15)F (Ln = La, Pr, Nd) expand linearly, and their thermal expansion coefficients (13-14) x 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 degrees 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.

引用

页码：54 / 59

页数：6

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