Ba1-xSrxTiO3陶瓷电畴的压电响应力显微研究

doi:10.3724/SP.J.1077.2010.00683

无机材料学报 ›› 2010, Vol. 25 ›› Issue (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¹, 吕文中¹, 汪小红¹, 王雨², 胡永明²

(1. 华中科技大学电子科学与技术系, 武汉430074; 2. 香港理工大学, 中国香港)

收稿日期:2009-10-23 修回日期:2009-12-01 出版日期:2010-07-20 网络出版日期:2010-06-10
基金资助:
国防基础科研项目(D1420060174)

Piezoresponse Force Microscopy Studies of Domain in Ba_1-xSr_xTiO₃ Ceramics

HE Jian-Ping¹, LV Wen-Zhong¹, WANG Xiao-Hong¹, WANG Yu², HU Yong-Ming²

(1. Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China; 2. The Hong Kong Polytechnic University, Hong Kong, China)

Received:2009-10-23 Revised:2009-12-01 Published:2010-07-20 Online:2010-06-10

摘要/Abstract

摘要：

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.

关键词: 钛酸锶钡, 压电响应力显微, 电畴, 极化反转

Abstract:

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.

Key words: barium strontium titanate, piezoresponse force microscopy, domain, polarization switching

中图分类号:

O48
TB34

何建平, 吕文中, 汪小红, 王雨, 胡永明. Ba_1-xSr_xTiO₃陶瓷电畴的压电响应力显微研究[J]. 无机材料学报, 2010, 25(7): 683-686.

HE Jian-Ping, LV Wen-Zhong, WANG Xiao-Hong, WANG Yu, HU Yong-Ming. Piezoresponse Force Microscopy Studies of Domain in Ba_1-xSr_xTiO₃ Ceramics[J]. Journal of Inorganic Materials, 2010, 25(7): 683-686.

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Ba_1-xSr_xTiO₃陶瓷电畴的压电响应力显微研究

Piezoresponse Force Microscopy Studies of Domain in Ba_1-xSr_xTiO₃ Ceramics

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