Anomalous piezoelectric effect in PbZr(1-x)TixO3
Abstract
High resolution x-ray powder diffraction measurements on poled PbZr(1-x)TixO3 (PZT) ceramic samples close to the rhombohedral-tetragonal phase boundary (the so-called morphotropic phase boundary, MPB) have shown that for both rhombohedral and tetragonal compositions, the piezoelectric elongation of the unit cell does not occur along the polar directions but along those directions associated with the monoclinic distortion. This striking result is strong evidence for the existence of local monoclinic displacements in both rhombohedral and tetragonal compositions, and supports the structural model proposed for the MPB (Noheda et al., cond-mat/9910066, to be published).Keywords
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