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Synthesis, Structure, and Ionic Conductivity of K3NdSi6O15

Published online by Cambridge University Press:  28 February 2011

Sossina M. Haile ,
Theo Siegrist ,
Robert A. Laudise  and
Bernhardt J. Wuensch
Sossina M. Haile
Affiliation:
Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 77 Massachusetts Avenue, Cambridge, MA 02139
Theo Siegrist
Affiliation:
AT&T, Bell Laboratories, 600 Mountain Avenue, Murray Hill, NJ 07974
Robert A. Laudise
Affiliation:
AT&T, Bell Laboratories, 600 Mountain Avenue, Murray Hill, NJ 07974
Bernhardt J. Wuensch
Affiliation:
Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 77 Massachusetts Avenue, Cambridge, MA 02139
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Abstract

A structure earlier reported for K3NdSi6O15 suggests the possibility for fast—ion conduction by virtue of K+ ions which not only reside in connected channels, but which also display very large thermal vibration amplitudes. No properties of the phase had heretofore been examined. Crystals up to 2mm inlength have been synthesized under a variety of hydrothermal conditions. Refinement of the structure with single crystal x-ray data to a residual of 8.3% confirms the composition and structure of our crystals and reveals a very high thermal vibration amplitude along c for K+ ions which reside in interconnected [001] channels.A reversible phase transformation has been discovered at 180ºC with a heat of transformation of 4J/g. Preliminary measurements of the conductivity of the high temperature phase yield a preexponential factor of 3.4/cm and an activation energy of 0.61ev along [001], indicating that this compound is not a particularly good fast—ion conductor.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 210: Symposium L – Solid State Ionics II , 1990 , 645
Copyright
Copyright © Materials Research Society 1991

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References

1. Pushcharovskii, D.Y., Karpov, O.G., Podeminskaya, E.A., Belov, N.B., Soy. Phys. Dokl. 2, 292 (1977).Google Scholar
2. Laudise, R.A., Growth of Single Crystals, (Prentice Hall, New York, 1970), p. 281.Google Scholar