Phase Diagram, Temperature Stability, and Electrical Properties of (0.85−x)Pb(Mg1/3Nb2/3)O3–0.10Pb(Fe1/2Nb1/2)O3–0.05PbZrO3–xPbTiO3 System
Phase Diagram, Temperature Stability, and Electrical Properties of (0.85−x)Pb(Mg1/3Nb2/3)O3–0.10Pb(Fe1/2Nb1/2)O3–0.05PbZrO3–xPbTiO3 System
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DOI：
10.1111/j.1551-2916.2012.05315.x
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发表时间：
2012-10
影响因子：
3.9
通讯作者：
Nengneng Luo;Qiang Li;Z. Xia;Xiangcheng Chu
中科院分区：
文献类型：
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作者：
Nengneng Luo;Qiang Li;Z. Xia;Xiangcheng Chu
(0.85采用改进的铌铁矿前驱体法制备了具有准同型相界（MPB）成分的（0. 85-x）Pb（Mg 1/3 Nb 2/3）O3 - 0. 10 Pb（Fe 1/2Nb 1/2）O3- 0. 05 PbZrO 3-xPbTiO 3 [（0. 85-x）PMN-0. 10 PFN-0. 05 PZ-xPT]多晶陶瓷。研究了其相变行为、组成对电学性能的影响以及温度对压电性能的影响。XRD和拉曼光谱分析表明，MPB组分位于PT含量为x = 0.30-0.34的区域附近，并通过其相应的介电、压电和机电性能得到证实。当x = 0.32时，复合材料的介电常数er、正切损耗tan δ、压电系数d33、机电耦合系数kp、剩余极化强度Pr和矫顽场Ec分别为3432、0.017、626 pC/N、0.56、29.90 μC/cm 2和7.23 kV/cm。相图表明该四元体系具有与其它二元和三元体系相似的MPB区。在MPB附近，PMN-PFN-PZ-PT四元体系的d33、kp和Tr−t比不含Fe的0.59Pb（Mg 1/3 Nb 2/3）O3-0.05PbZrO3-0.36PbTiO3（0.59PMN-0.05PZ-0.36PT）具有更强的竞争力，表现出相当的Pr、Ec、er、tan δ和Tc。温度依赖的场致应变和计算的高场d33也证实了含Fe的PMN-PFN-PZ-PT具有更高的温度稳定性。
(0.85−x)Pb(Mg1/3Nb2/3)O3–0.10Pb(Fe1/2Nb1/2)O3–0.05PbZrO3–xPbTiO3 [(0.85−x)PMN–0.10PFN–0.05PZ–xPT] polycrystalline ceramics with morphotropic phase boundary (MPB) compositions were prepared using the modified columbite precursor method. The phase transitional behaviors, composition-dependent electrical properties, and temperature-dependent piezoelectric properties were investigated, respectively. XRD and Raman spectrum analysis indicated that MPB compositions were located around the region with the PT content of x = 0.30–0.34, confirmed by their corresponding dielectric, piezoelectric, and electromechanical properties. The composition with x = 0.32 possessed the optimum properties with dielectric permittivity er, tangent loss tan δ, piezoelectric coefficient d33, electromechanical coupling coefficient kp, remnant polarization Pr, and coercive field Ec of 3432, 0.017, 626 pC/N, 0.56, 29.90 μC/cm2, and 7.23 kV/cm, respectively. The phase diagram mapped indicated that this quaternary system possesses the similar MPB region with that of other binary and ternary systems. The quaternary system PMN–PFN–PZ–PT possessed more competitive d33, kp, and Tr−t than that of Fe-free ternary 0.59Pb(Mg1/3Nb2/3)O3–0.05PbZrO3–0.36PbTiO3 (0.59PMN–0.05PZ–0.36PT) near MPB, exhibiting comparable Pr, Ec, er, tan δ, and Tc. Temperature-dependent field-induced-strain and the as-calculated high field d33 also confirmed higher temperature stability for Fe-contained PMN–PFN–PZ–PT.