Theory of tetragonal twin structures in ferroelectric perovskites with a first-order phase transition

Wenwu Cao, L. E. Cross

Research output: Contribution to journalArticle

275 Citations (Scopus)

Abstract

A three-dimensional Landau-Ginzburg model has been constructed to describe the tetragonal twin structures resulting from a first-order Oh-C4v proper ferroelectric phase transition in perovskites. The model takes into account the nonlinear and nonlocal characteristics of the polarization (order parameter) as well as the electromechanical coupling. Quasi-one-dimensional (Q1D) analytic solutions for the space profiles of the order parameter are obtained for a 180°twin and for a charge-neutral 90°twin with a special choice of parameters. Without the presence of interfacial defects, such as dislocations, the Q1D solutions require the support of inhomogeneous mechanical constraints. Elastic deformation and dimensional changes associated with the twin structures, and their implications on the piezoelectric effect in ferroelectric ceramics, are also addressed.

Original languageEnglish (US)
Pages (from-to)5-12
Number of pages8
JournalPhysical Review B
Volume44
Issue number1
DOIs
StatePublished - Jan 1 1991

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perovskites
elastic deformation
ceramics
defects
polarization
profiles

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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Theory of tetragonal twin structures in ferroelectric perovskites with a first-order phase transition. / Cao, Wenwu; Cross, L. E.

In: Physical Review B, Vol. 44, No. 1, 01.01.1991, p. 5-12.

Research output: Contribution to journalArticle

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