Copyright 2000, American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

The following article appeared in Appl. Phys. Lett. 77, 3642 (2000) and may also be found at .

R. Hemphill, L. Bellaiche, Alberto Garc\'{\i}a, and David Vanderbilt, Finite-temperature properties of disordered and ordered Pb(Sc$_{0.5}$Nb$_{0.5}$)O$_{3}$ alloys (in PDF format).

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