Electrostatic model of atomic ordering in complex perovskite alloys

Details Electrostatic model of atomic ordering in complex perovskite alloys Electrostatic model of atomic ordering in complex perovskite alloys

1998-06-23

arxiv.org/abs/cond-mat/9806273v1

Physics

Condensed Matter

Materials Science

4 pages, two-column style with 1 postscript figure embedded. Uses REVTEX and epsf macros. Also available at http://www.physi

Scientific paper

10.1103/PhysRevLett.81.1318

We present a simple ionic model which successfully reproduces the various types of compositional long-range order observed in a large class of complex insulating perovskite alloys. The model assumes that the driving mechanism responsible for the ordering is simply the electrostatic interaction between the different ionic species. A possible new explanation for the anomalous long-range order observed in some Pb relaxor alloys, involving the proposed existence of a small amount of Pb^4+ on the B sublattice, is suggested by an analysis of the model.

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