Effects of lanthanum modification on rhombohedral Pb(Zr_1−xTi_x)O_3 ceramics: Part I. Transformation from normal to relaxor ferroelectric behaviors
Effects of lanthanum modification on rhombohedral Pb(Zr_1−xTi_x)O_3 ceramics: Part I. Transformation from normal to relaxor ferroelectric behaviors
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DOI：
10.1557/jmr.1996.0075
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发表时间：
1996-03
影响因子：
2.7
通讯作者：
X. Dai;Z. Xu;Jiefang Li;D. Viehland
中科院分区：
文献类型：
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作者：
X. Dai;Z. Xu;Jiefang Li;D. Viehland
本文系统地研究了当Zr/Ti比为65/35和80/20以及不同La含量时，在钙钛矿结构（ABO_3）的A位引入La对菱方晶系Pb（Zr_1-xTi_ x）O_3（PZT）铁电陶瓷长程极性序的破坏作用。研究已经进行了热台透射电子显微镜，介电谱，和索耶塔极化（P-E）技术。观察到随着La含量的增加，极性纳米畴态从正常的微米级畴态的演变。这种极性簇状态的出现，其特征在于在介电响应中的强频率色散的发作，指示弛豫行为。发现驱动结构进入弛豫状态的La含量与未掺杂的基底组合物的晶格畸变有关。
The interruption of long-range polar order in rhombohedral ferroelectricPb(Zr_1− x Ti_ x )O_3 (PZT) ceramics has been systematically studied by incorporating La onto the A -site of the perovskite (ABO_3) structure for Zr/Ti ratios of 65/35 and 80/20 and various La contents. Studies have been performed by hot-stage transmission electron microscopy, dielectric spectroscopy, and Sawyer–Tower polarization ( P-E ) techniques. The evolution of a polar nanodomain state from a normal micron-sized domain state with increasing La content was observed. The emergence of this polar cluster state was characterized by the onset of strong frequency dispersion in the dielectric response, indicative of relaxor behavior. The La content that drives the structure into the relaxor state was found to be related to the lattice distortion of the undoped base composition.