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Nonstoichiometric fluorides-Solid electrolytes for electrochemical devices: A review

机译：用于电化学装置的非化学计量氟化物固体电解质：综述

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The solid electrolytes with fluorine-ion conductivity that were revealed during the analysis of the phase diagrams of the MF (m) -RF (n) systems within the program of search for new multicomponent fluoride crystalline materials carried out at the Shubnikov Institute of Crystallography, Russian Academy of Sciences, are described. The most widespread and promising materials are the nonstoichiometric phases with fluorite (CaF2) and tysonite (LaF3) structures, which are formed in the MF2-RF3 systems (M = Ca, Sr, Ba, Cd, or Pb; R = Sc, Y, or La-Lu). These phases have superionic fluorine conductivity due to the anion sublattice disorder. The ionic conductivity of crystals of both structure types has been studied and the limits of its change with composition and temperature are determined. Nonstoichiometric fluorides are used as solid electrolytes in chemical sensors, fluorine sources, and batteries. The prospects of the use of fluorine-ion conductors in solid-state electrochemical devices, principles of their operation, and the problems of optimization of their composition are discussed.
机译：在Shubnikov晶体学研究所进行的寻找新的多组分氟化物晶体材料的计划中，对MF（m）-RF（n）系统的相图进行分析期间揭示了具有氟离子导电性的固体电解质，俄罗斯科学院介绍。最广泛和最有前途的材料是在MF2-RF3系统中形成的萤石（CaF2）和钛矿（LaF3）结构的非化学计量相（M = Ca，Sr，Ba，Cd或Pb; R = Sc，Y ，或La-Lu）。由于阴离子亚晶格紊乱，这些相具有超离子氟电导率。研究了两种结构类型的晶体的离子电导率，并确定了其随组成和温度变化的极限。非化学计量的氟化物在化学传感器，氟源和电池中用作固体电解质。讨论了在固态电化学装置中使用氟离子导体的前景，其工作原理以及组成优化的问题。

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