标题：Ferroelectric, piezoelectric, and dielectric properties of BiScO_3-PbTiO_3-Pb(Cd_(1/3)Nb_(2/3))O_3 ternary high temperature piezoelectric ceramics
作者：Tian-Long Zhao;Jianguo Chen;Chun-Ming Wang;Yang Yu;Shuxiang Dong
作者机构：Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, People\'s Republic of
来源：Journal of Applied Physics
摘要：(0.95-x)BiScO_3-xPbTiO_3-0.05Pb(Cd_(1/3)Nb_(2/3))O_3 (BS-xPT-PCN) high temperature piezoelectric ceramics near the morphotropic phase boundary (MPB) have been synthesized by traditional solid-state reaction methods. The microstructural morphology, phase structure, and electrical properties of BS-xPT-PCN ceramics were investigated in detail. X-ray diffraction analysis indicated BS-xPT-PCN ceramics have a pure perovskite structure. The coexistence of rhombohedral and tetragonal phases at MPB composition enhanced the polarizability by the coupling between two dynamically equivalent energy states, resulting in the improved piezoelectric and ferroelectric properties at MPB vicinity. The BS-xPT-PCN (x = 0.60) ceramics possess the optimal piezoelectric and ferroelectric properties with d_(33) = 505pC/N, k_p = 55.9%, k_t = 36.5%, strain = 0.23% (under the electric field 37.5 kV/cm), and P_r = 39.7 μC/cm~2. High temperature dielectric behaviors showed diffuse phase transition in BS-xPT-PCN ceramics. The Curie temperature T_c was found to increase from 371℃ to 414℃ with x increasing from 0.58 to 0.62. All these results together with the good thermal stabilities make the BS-xPT-PCN ceramics promising candidates for high temperature piezoelectric applications.