Properties and Phase-transition Temperature of (1–x)Bi(Mg2/3Nb1/3)O3-xPbTiO3 Piezoelectric Ceramics Near the Morphotropic Phase Boundary

doi:10.3724/SP.J.1077.2012.11525

Abstract

Abstract: The (1–x)Bi(Mg_2/3Nb_1/3)O₃-xPbTiO₃ (BMN-PT) piezoelectric ceramics were fabricated by a traditional solid-reaction method. The crystal structures, the piezoelectric, dielectric and ferroelectric behaviors of BMN-PT ceramics were investigated as a function of the content of PbTiO₃. XRD results showed that a single perovskite structure was obtained in all ceramic samples. XRD patterns of the samples with PbTiO₃ content x≥0.60 had two obvious divided peaks, which verified that the rhombohedral and tetragonal phase were coexisted. The morphotropic phase boundary (MPB) of BMN-PT material was located at x=0.60. The largest piezoelectric coefficient d₃₃ (170 pC/N), remnant polarization Pr (31.4 μC/cm²), planar electromechanical coupling factor k_p (0.35) and the smallest coercive field E_c were obtained on 0.4BMN-0.6PT. The measurements of dielectric constant ε_r(T) dependencies showed that the maximum ε_r(T) temperature (T_m) increased with the increase of PbTiO₃ content, and Tm was about 276℃ for the MPB composition.

Key words: piezoelectric ceramic, BMN-PT, MPB, phase transition temperature

CLC Number:

TQ174

HONG Lin, ZHAO Li-Yan, ZHU Xing-Wen, ZHENG Liao-Ying, ZENG Jiang-Tao, LI Guo-Rong. Properties and Phase-transition Temperature of (1–x)Bi(Mg_2/3Nb_1/3)O₃-xPbTiO₃ Piezoelectric Ceramics Near the Morphotropic Phase Boundary[J]. Journal of Inorganic Materials, 2012, 27(7): 735-740.

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Properties and Phase-transition Temperature of (1–x)Bi(Mg_2/3Nb_1/3)O₃-xPbTiO₃ Piezoelectric Ceramics Near the Morphotropic Phase Boundary

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