MgO-Ba(Zr0.2Ti0.8)O3复相陶瓷介电性能研究-陕西师范大学学报期刊社网站

陕西师范大学学报（自然科学版）

物理学

MgO-Ba(Zr0.2Ti0.8)O3复相陶瓷介电性能研究

丁兰芳，陈宏，王景亮，李媛，付志粉，门高丽，刘鹏

((陕西师范大学物理学与信息技术学院，陕西西安 710062)

丁兰芳,女,硕士研究生,研究方向为电子信息功能材料.

摘要:

采用传统陶瓷工艺法，制备了100x%MgO-100(1-x)%Ba(Zr0.2Ti0.8)O3 (x=0.3，04，05，06) 复相陶瓷. 通过X射线衍射、扫描电镜、介电温谱等方法，研究了不同MgO含量对复相陶瓷的微观结构和介电特性的影响. 结果表明，MgO与Ba(Zr0.2Ti0.8)O3形成复相陶瓷，并且抑制了Ba(ZryTi1-y)O3 (BZT)晶粒生长．随着MgO含量的增加，材料的介电常数、介电损耗与可调度逐渐减小，介电弛豫特性逐渐增强.

关键词：

复相陶瓷；介电特性；介电弛豫行为

收稿日期：

2009-01-05

中图分类号：

O441.6

文献标识码：

文章编号：

1672-4291(2009)05-0024-04

基金项目：

国家自然科学基金资助项目(50572059，50872078)

Doi:

Study on the dielectric properties of MgO-Ba(Zr0.2Ti0.8)O3 composite ceramics

DING Lan-fang, CHEN Hong, WANG Jing-liang, LI Yuan, FU Zhi-fen, MEN Gao-li, LIU Peng

(College of Physics and Information Technology, Shaanxi Normal University, Xi′an 710062, Shaanxi, China)

Abstract:

The100 x %MgO-100(1-x) %Ba(Zr0.2Ti0.8)O3(x=03，04，05，06) composite ceramics are prepared by conventional ceramic processing. The effects of the concentration of MgO on the microstructures and dielectric properties of BZT composite ceramics are investigated by the X-ray diffraction, scanning electron microscopy and the dielectric spectroscopy. It is found that composite ceramics are formed from MgO and Ba(Zr0.2Ti0.8)O3 (BZT). Meanwhile, MgO has a effect on the reduction of BZT grain size as a grain inhibitor. With the increase of MgO content, the dielectric constant, dielectric loss and the tunability are suppressed gradually, and the dielectric relaxation process is enhanced gradually.

KeyWords:

composite ceramics; dielectric property; dielectric relaxation process