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Dielectric, piezoelectric, and electromechanical properties of morphotropic phase boundary compositions in the Pb(Mg1/3Ta2/3)O3PbZrO3PbTiO3 ternary system

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4 Author(s)
Hao, Hua ; State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, People’s Republic of China ; Zhang, Shujun ; Liu, Hanxing ; Shrout, Thomas R.

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Morphotropic phase boundary (MPB) compositions, separating the rhombohedral and tetragonal phases within the Pb(Mg1/3Ta2/3)O3PbZrO3PbTiO3 (PMT-PZ-PT) ternary system, were identified using x-ray diffraction and confirmed by their dielectric and piezoelectric properties. Optimal properties were found for the MPB composition of 0.4PMT-0.2PZ-0.4PT, with a dielectric constant εr and a piezoelectric coefficient (d33) of the order of 4000 and 580 pC/N, respectively. The planar and thickness electromechanical coupling factors were found to be kp=57.2% and kt=44.4%, with a moderate Curie temperature of 175 °C. Compositions with increasing PMT content (≫0.3) exhibited relaxorlike characteristics, showing dispersive dielectric behavior with respect to frequency, indicative of the decay of the macrodomain state to microdomain state.

Published in:

Journal of Applied Physics  (Volume:105 ,  Issue: 2 )

Date of Publication:

Jan 2009

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