Dielectric and Piezoelectric Properties of the Morphotropic Phase Boundary Composition in the (0.8−x) Pb(Mg1/3Ta2/3)O3−0.2PbZrO3−xPbTiO3 Ternary System |
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Authors: | Hua Hao Shujun Zhang Thomas R Shrout |
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Affiliation: | State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Material Science and Engineering, Wuhan University of Technology, Wuhan, China 430070; Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania, 16802 |
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Abstract: | Morphotropic phase boundary (MPB) compositions separating rhombohedral and tetragonal phases in the (1? x ? y )Pb(Mg1/3Ta2/3)O3– y PbZrO3– x PbTiO3 (PMT–PZ–PT100 x ) ternary solid solution system were characterized using X-ray diffraction and dielectric, piezoelectric properties. This work focused on compositions with a PZ content fixed at y =0.2, with an MPB composition found to be located at x =0.4. Piezoelectric coefficients and dielectric permittivity were found to be on the order of d 33=580 pC/N and 4100, respectively. Acceptor modification using manganese was found to induce a "hardening" effect in 0.4PMT–0.2PZ–0.4PT, with decreased piezoelectric coefficients d 33 and dielectric loss and increased mechanical quality factor Q . Piezoelectric coefficients d 33, Q values, and dielectric loss were found to be 500 pC/N, 2000, and 0.4%, respectively, for 0.4PMT–0.2PZ–0.4PT with MnO2 dopant levels around 0.5 wt%. The figure of merit (product of Q and d 33) was found to be on the order of 1 × 106, significantly higher when compared with other hard piezoelectric PZT materials. Specifically, the PMT–PZ–PT materials may be attractive candidates for high-power ultrasonic applications, particularly fine-scale components that require relating high permittivities. |
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