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Ionic Conductivity of the new Fluoride-Ion Conductor Casn2F6

Published online by Cambridge University Press:  11 February 2011

Michael F. Bell ,
Georges DéNés  and
Zhimeng Zhu
Michael F. Bell
Affiliation:
Laboratory of Solid State Chemistry and Mössbauer spectroscopy, Laboratories for Inorganic Materials, Department of Chemistry and Biochemistry, Concordia University, Montréal, Québec, Canada
Georges DéNés*
Affiliation:
Laboratory of Solid State Chemistry and Mössbauer spectroscopy, Laboratories for Inorganic Materials, Department of Chemistry and Biochemistry, Concordia University, Montréal, Québec, Canada
Zhimeng Zhu
Affiliation:
Laboratory of Solid State Chemistry and Mössbauer spectroscopy, Laboratories for Inorganic Materials, Department of Chemistry and Biochemistry, Concordia University, Montréal, Québec, Canada
*
1 To whom all correspondence should be addressed: gdenes@vax2.concordia.ca
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Abstract

Metastable CaSn2F6 has been prepared for the first time and characterized. It is a well crystalline material that leaches SnF2 in water to give the microcrystalline fluorite-type Ca1-xSnxF2 solid solution. In both materials, tin(II) is covalently bonded to fluorine, and thus carries a stereoactive non-bonding electronic pair. The electrical conductivity of CaSn2F6 was measured by the complex impedance method. The CaSn2F6 material was found to be a mixed conductor (τi = 0.50), with a F- conductivity a little below that of α-SnF2. On heating to 250°C, it decomposes irreversibly to give SnF2 and probably amorphous CaF2 (undetected).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 756: Symposia EE/FF – Solid-State Ionics – Materials for Fuel Cells and Fuel Processors , 2002 , EE3.5
Copyright
Copyright © Materials Research Society 2003

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References

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