Nonmonotonic TC trends in Bi-based ferroelectric perovskite solid solutions

Ilya Grinberg, Andrew M. Rappe

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70 Scopus citations

Abstract

We use first-principles density functional theory calculations to investigate the strongly nonlinear compositional trends in ferroelectric BiBO3-PbTiO3 solid solutions for a variety of cations on the perovskite B site. We demonstrate that previously tabulated crystal chemical parameters (extracted from other Pb-based perovskite alloys) permit accurate prediction of cation displacements in these new Bi-Pb alloys. We find that observed transition temperatures in these materials are well correlated with computed polarization magnitudes. The presented model for coupling between compositional variation and cation displacements explains the highly nonlinear and often nonmonotonic dependence of the Curie temperature (TC) on composition observed in these solid solutions.

Original languageEnglish
Article number037603
JournalPhysical Review Letters
Volume98
Issue number3
DOIs
StatePublished - 19 Jan 2007
Externally publishedYes

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