Russian Journal of Electrochemistry

, Volume 43, Issue 4, pp 398–409

Anionic high-temperature conduction in single crystals of nonstoichiometric phases R1 − yMyF3 − y (R = La-Lu, M = Ca, Sr, Ba) with the tysonite (LaF3) structure

  • N. I. Sorokin
  • B. P. Sobolev
Article

DOI: 10.1134/S1023193507040064

Cite this article as:
Sorokin, N.I. & Sobolev, B.P. Russ J Electrochem (2007) 43: 398. doi:10.1134/S1023193507040064

Abstract

Electrophysical properties of single crystals of nonstoichiometric phases R1 − yMyF3 − y, where R = La-Lu, M = Ca, Sr, or Ba, with the tysonite (LaF3) structure, which are present in a metastable state after being grown and cooled, are measured in the temperature interval extending from 300 to 1073 K. It is discovered that, during a sufficiently long high-temperature investigation, solid solutions R1 − yCayF3 − y, where R = Tb, Dy, or Ho, undergo irreversible variations in the phase composition in the temperature region 723 to 823 K. This level of temperatures, which correspond to partial decomposition of phases R1 − yCayF3 − y with the rare-earth elements of the end of the period, lies above the temperatures to which the fluoride solid electrolytes are usually heated when used in solid-state electrochemical devices. The temperature and concentration dependences of the phases’ electroconduction are explained in the framework of the vacancy mechanism of anionic transport.

Key words

ionic conduction solid electrolyte nonstoichiometry fluoride 

Copyright information

© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  • N. I. Sorokin
    • 1
  • B. P. Sobolev
    • 1
  1. 1.Shubnikov Institute of CrystallographyRussian Academy of SciencesMoscowRussia

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