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Dielectric and Piezoelectric Properties of the Morphotropic Phase Boundary Composition in the (0.8− x ) Pb(Mg 1/3 Ta 2/3 )O 3 −0.2PbZrO 3 − x PbTiO 3 Ternary System
Author(s) -
Hao Hua,
Zhang Shujun,
Shrout Thomas R.
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02465.x
Subject(s) - phase boundary , dielectric , materials science , piezoelectricity , analytical chemistry (journal) , tetragonal crystal system , dielectric loss , mineralogy , permittivity , figure of merit , solid solution , phase (matter) , crystallography , crystal structure , chemistry , composite material , metallurgy , optoelectronics , organic chemistry , chromatography
Morphotropic phase boundary (MPB) compositions separating rhombohedral and tetragonal phases in the (1− x − y )Pb(Mg 1/3 Ta 2/3 )O 3 – y PbZrO 3 – x PbTiO 3 (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 MnO 2 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 × 10 6 , 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.