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Fast-Ion Conduction and Disorder in Cation and Anion Arrays in Y2(Zry Ti1−y)2O7 Pyrochlores Induced by Zr Substitution: a Neutron Rietveld Analysis

Published online by Cambridge University Press:  25 February 2011

C. Heremans ,
B.J. Wuensch ,
J.K. Stalick  and
E. Prince
C. Heremans
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
B.J. Wuensch
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
J.K. Stalick
Affiliation:
Reactor Radiation Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
E. Prince
Affiliation:
Reactor Radiation Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
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Abstract

Structural refinements have been carried out on the Y2(ZryTi1−y)2O7 system for increasing amounts of Zr substitution. The structure changes from an ordered pyrochlore structure (superstructure of the fluorite structure) to an anion-deficient fluorite structure. Separate processes govern the disordering of the cation and anion arrays. In particular, the anions begin to disorder at lower values of y than the cations. For intermediate compositions, a minor amount of fluorite phase coexists with the primary partially-disordered pyrochlore phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 293: Symposium U – Solid State Ionics III , 1992 , 349
Copyright
Copyright © Materials Research Society 1993

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