Extrinsic contributions to the grain size dependence of relaxor ferroelectric Pb(Mg_1/3Nb_2/3)O_3: PbTiO_3 ceramics
Extrinsic contributions to the grain size dependence of relaxor ferroelectric Pb(Mg_1/3Nb_2/3)O_3: PbTiO_3 ceramics
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DOI：
10.1557/jmr.1993.0880
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发表时间：
1993-04
影响因子：
2.7
通讯作者：
Clive A. Randall;A. D. Hilton;David J. Barber;T. Shrout
中科院分区：
文献类型：
--
作者：
Clive A. Randall;A. D. Hilton;David J. Barber;T. Shrout
本文研究了晶粒尺寸≥ 1.0 μm的Pb（Mg_1/3Nb_2/3）O_3：PbTiO_3陶瓷的晶粒尺寸与介电性能的关系。结合透射电子显微镜（TEM）分析和介电特性建模与修改后的砖墙的方法。从该模型可以外推弛豫陶瓷的单晶介电常数K _max、扩散系数δ和平均晶间厚度等信息。计算的晶间厚度与TEM观察结果吻合良好，约为2.0 nm。这种半经验的方法可能是潜在的有用的弛豫陶瓷的开发工作，以预测优化的介电性能可在微观结构的限制。
This paper addresses the observed grain size with dependence of the dielectric behavior for Pb(Mg_1/3Nb_2/3)O_3: PbTiO_3 ceramics grain sizes ≥ 1.0 μm. A combined transmission electron microscopy (TEM) analysis and dielectric characterization are modeled with a modified brick wall approach. From this model, it is possible to extrapolate information such as single crystal values of dielectric maximum, K _max, the diffuseness coefficient, δ, and the average intergranular thickness for relaxor ceramics. The calculated intergranular thickness agrees well with TEM observations, ≍2.0 nm. This semi-empirical method may be potentially useful in development work of relaxor ceramics to predict the optimized dielectric properties obtainable within microstructural restrictions.