Effective electromechanical moduli of ferroelectric ceramics with fiber textures

Authors

Y.C. Zhou, Xiangtan University, China
J. Liu, University of Colorado-Boulder
Jiangyu Li, University of Nebraska-LincolnFollow

Date of this Version

6-23-2005

Comments

Published in APPLIED PHYSICS LETTERS 86, 262909 2005. © 2005 American Institute of Physics. Used by permission.

Abstract

In this letter, we report the predictions on the effective piezoelectric coefficients and electromechanical coupling factors of ferroelectric ceramics BaTiO ₃ and Pb(Mg _1/3Nb _2/3)O ₃–PbTiO ₃ (PMN-PT) with various fiber textures, including [001], [011], and [111], using a two-scale micromechanical model that accounts for microstructural phenomena at both domain and grain levels. It was observed that for BaTiO ₃ the [011] texture is optimal with highest d ₃₁ and d ₃₃, while for PMN-PT [001] texture is optimal despite the fact that [011]-oriented single-crystalline PMN-PT has higher d ₃₂ than that of [001]-oriented PMN-PT single crystal. In fact, [011]-textured PMN-PT ceramics have much smaller piezoelectric coefficients d ₃₂ and d ₃₃ than does [011]-oriented PMN-PT single crystal. It is also noted that [001]-textured BaTiO ₃ and PMN-PT ceramics have even higher electromechanical coupling factor k ₃₁ than that of [001]-oriented single crystals.