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Conduction and Disorder in Y3NbO7 - Zr2Y2O7

Published online by Cambridge University Press:  01 February 2011

Dario Marrocchelli ,
Paul A. Madden ,
Stefan T. Norberg  and
Stephen Hull
Dario Marrocchelli
Affiliation:
[email protected], University of Edinburgh, Chemistry, Edinburgh, United Kingdom
Paul A. Madden
Affiliation:
[email protected], University of Edinburgh, Chemistry, Edinburgh, United Kingdom
Stefan T. Norberg
Affiliation:
[email protected], Chalmers Institute of Technology, Chemical Engineering, Gothenburg, Sweden
Stephen Hull
Affiliation:
[email protected], Rutherford Appleton Laboratory, ISIS Facility, Didcot, United Kingdom
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Abstract

The construction of interaction potentials for the Y0.5+0.25xNb0.25xZr0.5–0.5xO1.75 system, on a purely ab-initio basis, is described. These potentials accurately reproduce experimental data on both the structure and the dynamics of these systems; the computer simulations also reproduce the experimental trend of the conductivity, which decreases as x increases, and of the level of static disorder within the O2− sublattice, which increases with x. A detailed analysis of these phenomena shows that the static disorder in Y3NbO7 is caused by the high Nb5+ charge and that in this material the conduction is heterogeneous, i.e. some anions are completely immobile while some others are very mobile. The role of the cation sublattice is explained in detail.

Keywords

ionic conductorsimulationneutron scattering
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1126: Symposium S – Solid-State Ionics–2008 , 2008 , 1126-S06-07-PP05-07
Copyright
Copyright © Materials Research Society 2009

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References

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