Ba1-xSrxTiO3陶瓷电畴的压电响应力显微研究

无机材料学报, 2010, 25(7): 683-686. doi: 10.3724/SP.J.1077.2010.00683

Ba_1-xSr_xTiO₃陶瓷电畴的压电响应力显微研究

何建平 , 吕文中 , 汪小红 , 王雨 , 胡永明

(1. 华中科技大学电子科学与技术系, 武汉430074

2. 2. 香港理工大学, 中国香港)

(1. Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China

基金项目: 国防基础科研项目(D1420060174)

关键词：钛酸锶钡 , piezoresponse force microscopy , domain , polarization switching

Piezoresponse Force Microscopy Studies of Domain in Ba_1-xSr_xTiO₃ Ceramics

HE Jian-Ping , LV Wen-Zhong , WANG Xiao-Hong , WANG Yu , HU Yong-Ming

Keywords： barium strontium titanate , 压电响应力显微 , 电畴 , 极化反转

采用常规固相反应法制备了Ba_1-xSr_xTiO₃(x=0.7, 0.4, 0.1)陶瓷, 利用扫描力显微镜的压电响应模式得到了压电响应像, 并观察到了外加直流电压时的电畴诱导和极化反转. 在10V电压下(样品厚90μm, 下同), 室温时顺电体Ba_0.6Sr_0.4TiO₃中诱导出了铁电畴, 而顺电体Ba_0.3Sr_0.7TiO₃中并未诱导出铁电畴. 12V和–12V电压下, Ba_0.9Sr_0.1TiO₃中的电畴发生了明显的极化反转. 对x=0.4、0.1的样品使用透射电子显微镜进行观察, 发现室温下前者无电畴, 进一步验证了压电响应图像的结果; 后者有电畴, 且为鱼刺状的畴结构. 同时对顺电相Ba1-xSrxTiO3材料中非线性介电特性的起源进行了探讨.

The character of the domain structures in Ba_1-xSr_xTiO₃(x=0.7, 0.4, 0.1) ceramics prepared by the solid-state reaction was investigated by piezoresponse force microscope (PFM) and transmission electron microscope (TEM). The PFM results indicate that the domains are induced in paraelectric phase Ba_0.6Sr_0.4TiO₃ under 10V dc voltage applied between the tip and the bottom electrode. However, no domain appears in paraelectric phase Ba_0.3Sr_0.7TiO₃ under the same external voltage. The polarization reversal occurs in Ba_0.9Sr_0.1TiO₃ after application of 12V and –12V dc bias voltage. Furthermore, the TEM images show that no domain is found in Ba_0.6Sr_0.4TiO₃, while the herringbone domain structure is found in Ba_0.9Sr_0.1TiO₃. The mechanism of nonlinear dielectric properties of paraelectric phase Ba_1-xSr_xTiO₃ ceramic is also discussed.

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