Optimization of single crystals of solid electrolytes with tysonite-type structure (LaF3) for conductivity at 293 K: 2. Nonstoichiometric phases R 1−y M y F3−y (R = La-Lu, Y; M = Sr, Ba)
Authors:
- 23 January 2015
- journal article
- Published by Pleiades Publishing Ltd in Crystallography Reports
- Vol. 60 (1) , 123-129
Abstract
Single crystals of fluorine-conducting solid electrolytes R 1 − y Sr y F3 − y and R 1 − y Ba y F3 − y (R = La-Lu, Y) with a tysonite-type structure (LaF3) have been optimized for room-temperature conductivity σ293 K. The optimization is based on high-temperature measurements of σ(T) in two-component nonstoichiometric phases R 1 − y M y F3 − y (M = Sr, Ba) as a function of the MF2 content. Optimization for thermal stability is based on studying the phase diagrams of MF2-RF3 systems (M = Sr, Ba) and the behavior of nonstoichiometric crystals upon heating when measuring temperature dependences σ(T). Single crystals of many studied R 1 − y Sr y F3 − y and R 1 − y Ba y F3 − y phases have σ293 K values large enough to use these materials in solid-state electrochemical devices (chemical sensors, fluorine-ion batteries, accumulators, etc.) operating at room temperature.Keywords
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