Study on structure and properties of Pb(Sc_1/2Nb_1/2)O₃-Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃ ternary ceramics near morphotropic phase boundary

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• 作者：Zengzhe Xi ; ^{zzhxi@xatu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zexin Hou ; Xiaojuan Li ; Pinyang Fang ; Wei Long
• 关键词：PSN&ndash ; PMN&ndash ; PT ternary ceramic ; Morphotropic phase boundary ; Temperature stability
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：41
• 期：supp_S1
• 页码：S787-S791
• 全文大小：803 K

文摘

xPb(Sc_1/2Nb_1/2)O₃–yPb(Mg_1/3Nb_2/3)O₃–zPbTiO₃ (xPSN–yPMN–zPT, x/y/z=5/61/34, 25/38/37, 45/14/41) ceramics with morphotropic phase boundary (MPB) were prepared by a modified two-step columbite precursor method. The structure and electrical properties of ceramics were investigated. X-ray diffraction shows a pure perovskite structure without any trace of second phase. All of the ceramics exhibit high density and homogeneous microstructure, indicating that the modified two-step columbite precursor method is very feasible to fabricate PSN–PMN–PT ceramics. With increasing the content of PSN, the Curie temperature T_C and phase transition temperature of rhombohedral to tetragonal T_R–T increased obviously. The optimal properties achieved in 25PSN–38PMN–37PT with piezoelectric coefficient d₃₃=478 pC/N, dielectric permittivity ε_max=8338, planar electromechanical coupling k_p=65.1%, and Curie temperature T_C=192.2 °C, respectively. Dielectric measurement shows that the PSN–PMN–PT ceramics near MPB display the relaxor-like characteristics.