Normal‐Relaxor‐Diffuse Ferroelectric Phase Transition and Electrical Properties of Bi(Mg1/2Ti1/2)3–PbZrO3–PbTiO3 Solid Solution Ceramics Near the Morphotropic Phase Boundary |
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Authors: | Haifeng Yi Ruzhong Zuo |
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Affiliation: | Institute of Electro Ceramics & Devices, School of Materials Science and Engineering, Hefei University of Technology, , Hefei, 230009 China |
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Abstract: | Perovskite‐type xBi(Mg1/2Ti1/2)O3–(0.56 ? x)PbZrO3–0.44PbTiO3 (xBMT–PZ–PT) ternary solid solution ceramics were synthesized via a conventional solid‐state reaction method. The phase transition behaviors, dielectric, ferroelectric, and piezoelectric properties were investigated as a function of the BMT content. The X‐ray diffraction analysis showed that the tetragonality of xBMT–PZ–PT was enhanced with increasing the BMT content, and a morphotropic phase boundary (MPB) between rhombohedral and tetragonal phases was identified approximately in the composition of x = 0.08. In addition, the dielectric diffuseness and frequency dispersion behavior were induced with the addition of BMT and a normal‐relaxor‐diffuse ferroelectric transformation was observed from the PZ‐rich side to the BMT‐rich side. The electrical properties of xBMT–PZ–PT ceramics exhibit obviously compositional dependence. The x = 0.08 composition not only possessed the optimum properties with εT33/ε0 = 1450, Qm = 69, d33 = 390 pC/N, kp = 0.46, Pr = 30 μC/cm2, Ec = 1.4 kV/mm, Tc = 325°C, and a strain of 0.174% (d33* = 436 pm/V) under an electric field of 4 kV/mm as a result of the coexistence of two ferroelectric phases near the MPB, but also owned a good thermal‐depolarization behavior with a d33 value of >315 pC/N up to 290°C and a frequency‐insensitive strain behavior. |
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