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Studying Ionic Conductivity with Diffraction Techniques an Application to laF3

Published online by Cambridge University Press:  21 February 2011

Andreas Belzner  and
Heinz Schulz
Andreas Belzner
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305
Heinz Schulz
Affiliation:
Institut für Kristallographie der Universität München, Theresienstrasse 41, 8000 München 2, Federal Republic of Germany
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Abstract

The LaF3-structure has been reinvestigated using diffraction data measured with twinned crystals.

LaF3 is fluoride ion conductor with essentially 3-dimensional conductivity. The conduction perpendicular to the c-axis is shown to occur on paths which include all three sets of fluorine positions in the structure and which connect symmetrically non-equivalent nearest neighbor positions only. This is confirmed by determination of anharmonic temperature factors. The temperature dependence of the harmonic thermal parameters indicates that thermal vibrations are described rather than static disorder. The magnitude of the temperature factors of fluorine is consistent with an intrinsic activation energy of 0.8 eV for fluorine conduction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 135: Symposium M – Solid State Ionics I , 1988 , 227
Copyright
Copyright © Materials Research Society 1989

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