Dielectric Characteristics of Perovskite‐Structured High‐Temperature Relaxor Ferroelectrics: The BiScO3–Pb(Mg1/3Nb2/3)O3–PbTiO3 Ternary System
Dielectric Characteristics of Perovskite‐Structured High‐Temperature Relaxor Ferroelectrics: The BiScO3–Pb(Mg1/3Nb2/3)O3–PbTiO3 Ternary System
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DOI：
10.1111/j.1551-2916.2008.02298.x
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发表时间：
2008-06
影响因子：
3.9
通讯作者：
C. Stringer;N. J. Donnelly;T. Shrout;C. Randall;E. Alberta;W. Hackenberger
中科院分区：
文献类型：
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作者：
C. Stringer;N. J. Donnelly;T. Shrout;C. Randall;E. Alberta;W. Hackenberger
在高温Bi（Me）O3-PbTiO 3系铁电体的基础上，研究了一个新的弛豫铁电体族.在xBiScO 3-yPb（Mg 1/3 Nb 2/3）O3-zPbTiO 3（xBS-yPMN-zPT）三元体系的准同型相界（MPB）附近制备了组合物，该三元体系在1 kHz下表现出Tmax为250°-350 ° C和emax为10000-24000的高温弛豫特性。低场交流磁场的分析通过Vogel-Fulcher型依赖性的介电常数，使活化能，EA，和冻结温度，Tf的关键参数被确定。在较宽的温度范围内研究了铁电材料的回复极化，发现在T_（Tmax）温度下具有典型的铁电方回线滞后行为，由Curie-Weiss分析得到的偏离温度T_（To）为~ 600°C。比较了高温钙钛矿型弛豫体和经典的铅弛豫体Pb（Mg 1/3 Nb 2/3）O3（PMN）的电学特性。
A new compositional family of relaxor ferroelectrics was investigated based on the high-temperature Bi(Me)O 3 -PbTiO 3 ferroelectric perovskite family. Compositions were fabricated near an estimated morphotropic phase boundary (MPB) of the xBiScO 3-y Pb(Mg 1/3 Nb 2/3 )O 3 -zPbTi03 (xBS-yPMN-zPT) ternary system exhibiting high-temperature relaxor properties of T max ∼250°-350°C and e max ∼10000-24000 at 1 kHz. Analysis of the low-field a.c. permittivity by a Vogel-Fulcher type dependence enabled key parameters of activation energy, E A , and freezing temperature, T f , to be determined. The remanent polarization was studied over a broad temperature range and was observed to show classical ferroelectric square loop hysteresis behavior at temperatures T T max , the deviation temperature, To, was obtained from Curie-Weiss analysis and found to be ∼600°C. A comparison of characteristic electrical properties was made between the high-temperature perovskite relaxors and the classical complex lead relaxor compound, Pb(Mg 1/3 Nb 2/3 )O 3 (PMN).