Origin of the high piezoelectric response in PbZr(1-x)TixO3
R. Guo, L.E. Cross, S-E. Park, B. Noheda, D.E. Cox, G. Shirane
TL;DR
This study reveals that the high piezoelectric response in PbZr(1-x)TixO3 (PZT) near the MPB originates from unit cell elongation along monoclinic distortion directions, not polar directions.
Contribution
It provides the first direct evidence linking monoclinic distortion to high piezoelectricity in PZT near the MPB.
Findings
Piezoelectric elongation occurs along monoclinic distortion directions.
High piezoelectric response is associated with monoclinic phase.
Evidence is based on high-resolution x-ray diffraction measurements.
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 work provides the first direct evidence for the origin of the very high piezoelectricity in PZT.
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