The following article appeared in Appl. Phys. Lett. 77, 3642 (2000) and may also be found at http://link.aip.org/link/?APL/77/3642 .
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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