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Monitoring of Process of Ion Transport in Nonstoichiometric Fluorides with the LaF3 Structure

Published online by Cambridge University Press:  16 February 2011

Nikolay I. Sorokin
Affiliation:
Institute of Crystallography, Russian Academy of Sciences, Leninsky prospect 59, Moscow 117333, Russia
Boris P. Sobolev
Affiliation:
Institute of Crystallography, Russian Academy of Sciences, Leninsky prospect 59, Moscow 117333, Russia
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Abstract

Fluoride compounds with the tysonite (LaF3- type) crystal structure form an important class of materials which find diverse technological applications as fast ionic conductors. The results of investigations of the ionic conductivity process within tysonite structured R1-xMxF3-x single crystals (R=rare earths and M=alkali-rare earths) are presented using various techniques of electrical response spectroscopy. Influence of isomorphic substitutions of iso- and heterovalent cations on ion transport parameters was studied. By monitoring the composition of nonstoichiometric R1-xMxF3-x. crystals we can vary fluorine-ion conductivity within the range 10−7 - 10−4 S/cm at 293 K and 10−4 - 10−2 S/cm at 500 K. The studied nonstoichiometric crystals with the LaF3-structure are promising solid electrolytes which can be used in chemical sensors and fluorine generators.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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References

references

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