(BaxSr1-x)TiO3/Mg2TiO4组分梯度陶瓷的制备及介电性能

doi:10.3724/SP.J.1077.2014.12744

无机材料学报 ›› 2014, Vol. 29 ›› Issue (1): 52-56.DOI: 10.3724/SP.J.1077.2014.12744

(Ba_xSr_1-x)TiO₃/Mg₂TiO₄组分梯度陶瓷的制备及介电性能

李俊^{1, 2}, 王旭升¹, 柴晓娜², 刘鹏³

(1. 同济大学功能材料研究所, 上海 200092; 2.阜阳师范学院物理与电子科学学院, 阜阳236037; 3.陕西师范大学物理学与信息技术学院, 西安710062)

收稿日期:2012-12-10 修回日期:2013-04-16 出版日期:2014-01-20 网络出版日期:2013-12-09
作者简介:李俊(1980-), 男, 博士研究生. E-mail: 168lijun@tongji.edu.cn
基金资助:
安徽省教育厅自然科学基金(KJ2012B129); 阜阳师范学院自然科学基金(2011FSKJ12); 国家自然科学基金(51271059)

Preparation and Dielectric Properties of (Ba_xSr_1-x)TiO₃/Mg₂TiO₄ Composite Ceramics with A Functionally Graded Structure

LI Jun^{1, 2}, WANG Xu-Sheng¹, CHAI Xiao Na², LIU Peng³

(1. Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China; 2. School of Physics and Electronics, Fuyang Normal College, Fuyang 236041, China; 3. College of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, China)

Received:2012-12-10 Revised:2013-04-16 Published:2014-01-20 Online:2013-12-09
About author:LI Jun. E-mail: 168lijun@tongji.edu.cn
Supported by:
Research Foundation of Education Department of Anhui Province (KJ2012B129); Research Foundation of Fuyang Normal College (2011FSKJ12); National Natural Science Foundation of China (51271059)

摘要/Abstract

摘要： 采用叠层法制备了(Ba_xSr_1-x)TiO₃/Mg₂TiO₄组分梯度陶瓷。采用XRD、SEM、EDS及介电性能测试等手段分析了材料的微观结构和介电性能。结果表明: 1375℃烧结3 h的样品较致密、结晶良好, 由钙钛矿和尖晶石两相复合而成, 且材料内存在Ba/Sr比组分梯度; 与不含梯度的复合陶瓷相比, 梯度陶瓷不但保持了较大的介电可调度, 而且具有较好的介电性能温度稳定性; 在室温(20℃)和2 kV/mm电场下, 典型样品的介电可调度可达21.9%, 当温度升高到60℃时, 其可调度仍然保持在较大的值(9.3%)。温度稳定性的改善可归因于不同组分的(Ba_xSr_1-x)TiO₃具有不同的铁电-顺电相转变温度, 组分梯度的设计有利于该类材料应用温度范围的拓宽。

关键词: 复合陶瓷, (Ba_xSr_1-x)TiO₃/Mg₂TiO₄, 功能梯度材料, 介电性能

Abstract: (Ba_xSr_1-x)TiO₃/Mg₂TiO₄ composite ceramics with a constituent graded structure were prepared by a solid-state reaction method. Their microstructure and dielectric properties were analyzed by X-Ray diffraction (XRD), Scanning Electron Microscope (SEM), Energy Dispersive Spectroscope (EDS) and dielectric property measurements. The results show that the samples sintered at 1375℃ for 3 h are a composite phase of perovskite and spinel structure with a Ba/Sr ratio composition gradient. Compared with the composite samples with a fixed Ba/Sr ratio, the graded samples possess higher tunability and better temperature stability of dielectric properties. At room temperature (20℃), the tunability of a typical sample is 21.9% under an external DC field of 2 kV/mm, and it maintains a high value of 9.3% at high temperature of 60℃. The improvement of temperature stability is due to the difference in Curie temperature for different layers in gradient (Ba,Sr)TiO₃. Meanwhile, the introduction of the composition gradient in this material helps us to obtain a wide temperature application range for the related device.

Key words: composite ceramics, (Ba_xSr_1-x)TiO₃/Mg₂TiO₄, functionally graded materials, dielectric properties

中图分类号:

TB34

李俊, 王旭升, 柴晓娜, 刘鹏. (Ba_xSr_1-x)TiO₃/Mg₂TiO₄组分梯度陶瓷的制备及介电性能[J]. 无机材料学报, 2014, 29(1): 52-56.

LI Jun, WANG Xu-Sheng, CHAI Xiao Na, LIU Peng. Preparation and Dielectric Properties of (Ba_xSr_1-x)TiO₃/Mg₂TiO₄ Composite Ceramics with A Functionally Graded Structure[J]. Journal of Inorganic Materials, 2014, 29(1): 52-56.

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(Ba_xSr_1-x)TiO₃/Mg₂TiO₄组分梯度陶瓷的制备及介电性能

Preparation and Dielectric Properties of (Ba_xSr_1-x)TiO₃/Mg₂TiO₄ Composite Ceramics with A Functionally Graded Structure

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