High-temperature dielectrics based on (1-x)(0.94Bi0.5Na0.5TiO3-0.06BaTiO3)-xNaNbO3 system

被引:83
作者
Jia, Wenxu [1 ]
Hou, Yudong [1 ]
Zheng, Mupeng [1 ]
Zhu, Mankang [1 ]
机构
[1] Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
基金
中国国家自然科学基金;
关键词
Bi0.5Na0.5TiO3; NaNbO3; High-temperature dielectrics; Capacitor; BI0.5NA0.5TIO3 BASED CERAMICS; ENERGY-STORAGE; IMPEDANCE SPECTROSCOPY; ELECTRICAL-PROPERTIES; PIEZOELECTRIC CERAMICS; (BI1/2NA1/2)TIO3-BATIO3; BEHAVIOR; CAPACITORS; NANBO3; NA0.5BI0.5TIO3;
D O I
10.1016/j.jallcom.2017.07.030
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The microstructure, phase structure, ferroelectric and dielectric properties of (1-x)(0.94Bi(0.5)Na(0.5)TiO(3-)0.06BaTiO(3))-xNaNbO(3) (BNT-BT-xNN) ceramics were investigated as candidates for high-temperature capacitors with a working temperature far beyond 200 degrees C. The decreased polar rhombohedral phase shown in XRD and the weakened macroscopical polarization in P-E test indicate that NN addition can dilute the mutual coupling of polar nanoregions (PNRs), which is very conducive to flattening the curves of temperature dependent dielectric permittivity at the expense of a small reduction in dielectric permittivity values. Among all manufactured samples, those with composition of x = 0.10 showed a high permittivity of more than 2700 (1 kHz) and energy storage density of 0.61 J/cm(3) (7 kV/mm) at 150 degrees C with a Delta C/C-150 degrees C varying no more than 15% in a wide temperature range of 54 degrees C-318 degrees C. All of these exhibit wonderful temperature stable dielectric properties and indicated the promising future of BNT-BT-xNN system as high-temperature ceramic capacitors. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:306 / 315
页数:10
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