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Production and Study of Ca/Sn(II) Metastable Fluoride Ion Conductors

Published online by Cambridge University Press:  10 February 2011

Michael F. Bell ,
Georges Dénès  and
Zhimeng Zhu
Michael F. Bell
Affiliation:
Department of Chemistry and Biochemistry, Laboratory of Solid State Chemistry and Mössbauer Spectroscopy, Laboratories for Inorganic Materials, Concordia University, Montréal, Québec, H3G 1M8, Canada, gdenes@vax2.concordia.ca
Georges Dénès
Affiliation:
Department of Chemistry and Biochemistry, Laboratory of Solid State Chemistry and Mössbauer Spectroscopy, Laboratories for Inorganic Materials, Concordia University, Montréal, Québec, H3G 1M8, Canada, gdenes@vax2.concordia.ca
Zhimeng Zhu
Affiliation:
Department of Chemistry and Biochemistry, Laboratory of Solid State Chemistry and Mössbauer Spectroscopy, Laboratories for Inorganic Materials, Concordia University, Montréal, Québec, H3G 1M8, Canada, gdenes@vax2.concordia.ca
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Abstract

Precipitation reactions from aqueous solutions of calcium nitrate and tin(II) fluoride result in the formation of two metastable phases, depending on the reaction conditions. Crystalline CaSn2F6 and the microcrystalline Ca1-xSnxF2 solid solution are obtained, the latter crystallizing in the cubic fluorite (CaF2) type with total Ca/Sn disorder. Both phases are fluoride ion conductors. Electrical conductivity measurements versus temperature and bulk density measurements show that both phases are far from thermodynamic equilibrium at ambient conditions, and thus are metastable. Both decompose to a mixture of SnF2 and CaF2 at high temperature. In addition, CaSn2F6 is chemically unstable in an aqueous medium, in which it looses SnF2 to give the microcrystalline Ca1-xSnxF2 solid solution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 481: Symposium P – Science and Technology of Semiconductor Surface Preparation , 1997 , 273
Copyright
Copyright © Materials Research Society 1998

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References

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