Structural phase transition behaviour and electrical properties of Pb(Mg1/3Nb2/3)O3–PbTiO3–PbZrO3 ceramics
Structural phase transition behaviour and electrical properties of Pb(Mg1/3Nb2/3)O3–PbTiO3–PbZrO3 ceramics
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DOI：
10.1088/0022-3727/40/24/036
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发表时间：
2007-12
期刊：
影响因子：
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通讯作者：
Z. Xia;Qiang Li
中科院分区：
文献类型：
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作者：
Z. Xia;Qiang Li
系统研究了（1 − x − y）Pb（Mg 1/3 Nb 2/3）O3-yPbTiO 3-xPbZrO 3（PMN-PT-PZ）压电陶瓷（x = 0.025，0.05，0.075和0.1，接近准同型相界（MPB））随PT含量（y）的变化。随着PT含量的增加，在每个固定的PZ含量系列中，陶瓷的结构都经历了一个从菱方相到四方相的逐渐转变过程。压电系数（d33）、机电系数（kp）、剩余极化（Pr）和介电常数（εr）等电学性质在MPB附近都出现了对应于结构相变的峰值。对（0.95-y）PMN-yPT-0.05PZ陶瓷介电常数的温度依赖性的研究表明，在某些选定的成分中，可以获得增加的居里温度Tc和菱形/四面体相变温度TR-T以及相对较高的电性能。这表明该三元体系在高温应用中值得进一步探索，特别是在高温弛豫基铁电单晶的候选材料研究方面具有重要意义。
Piezoelectric ceramics with compositions of (1 − x − y)Pb(Mg1/3Nb2/3)O3–yPbTiO3–xPbZrO3 (PMN–PT–PZ), x = 0.025, 0.05, 0.075 and 0.1, close to the morphotropic phase boundary (MPB) were systematically investigated as a function of PT content (y). With increasing PT content, the structures of ceramics in every fixed PZ content series experience a gradual transition process from the rhombohedral to the tetragonal phase near the MPB. Electrical properties such as piezoelectric coefficient (d33), electromechanical factor (kp), remnant polarization (Pr) and dielectric constant (εr) in the respective series all exhibit the peak values corresponding to the structural phase transition near the MPB. Investigations on the temperature dependence of the dielectric constant of (0.95−y)PMN–yPT–0.05PZ ceramics show that an increased Curie temperature Tc and rhombohedral/tetragonal phase transition temperature TR–T, as well as relatively high electrical properties, can be obtained in some selected compositions. This indicates that the ternary system deserves further exploration for high-temperature applications, especially for the hot research on promising candidates for high-temperature relaxor-based ferroelectric single crystals.