Ba0.6Sr0.4TiO3/MgO/Mg2SiO4复相陶瓷的制备与介电可调性能-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）

专题研究

Ba0.6Sr0.4TiO3/MgO/Mg2SiO4复相陶瓷的制备与介电可调性能

李俊，刘鹏*，边小兵，孟玲

(陕西师范大学物理学与信息技术学院，陕西西安 710062)

李俊，男，硕士研究生，研究方向为电介质材料性能．

摘要:

采用标准电子陶瓷工艺，制备了Ba06Sr04TiO3/MgO/Mg2SiO4复相陶瓷（MgO和Mg2SiO4按相同重量加入），研究了MgO和Mg2SiO4含量对复相陶瓷微观结构、介电性能及介电可调性的影响．结果表明，随着MgO和Mg2SiO4含量的增加，陶瓷的晶粒尺寸略有增大，低频（100 kHz）介电常数、介电损耗、介电可调度和介电常数温度系数降低．随着偏置电场的增强，介电常数降低，介电损耗变化不大（均在10-3量级）．当MgO和Mg2SiO4的百分含量均为30%时，获得了室温介电常数为1016、介电损耗为0001 7及179 kV/mm偏置电场下介电可调度为1219%、介电常数温度系数为0009 ℃-1的介电性能．

关键词：

无机非金属材料；钛酸锶钡；介电性能

收稿日期：

2007-03-15

中图分类号：

O511＋3

文献标识码：

文章编号：

1672-4291(2007)02-0047-04

基金项目：

Doi:

Study on the fabrication and dielectric tunability of Ba0.6Sr0.4TiO3/MgO/Mg2SiO4 composite ceramics

LI Jun，LIU Peng, BIAN Xiao-bing, MENG Ling

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

Abstract:

The Ba0.6Sr0.4TiO3/MgO/Mg2SiO4 composite ceramics with equivalent weight MgO and Mg2SiO4 are prepared by a standard electronic ceramic processing. The effects of the concentration of MgO and Mg2SiO4 on the microstructures, dielectric properties and tunability of Ba0.6Sr0.4TiO3/MgO/Mg2SiO4 ceramic composites are investigated. With the increase of the concentrations of MgO and Mg2SiO4, the relative dielectric constant, dielectric loss, tunability and temperature coefficient of dielectric constant at low frequency (100 kHz) decrease, and the grain size increases slightly. With the increase of applied electric field, the relative dielectric constant decreases gradually and dielectric loss has a slightly change at the grade of 10-3.When the concentrations of MgO and Mg2SiO4 are 30 wt% respectively, the relative dielectric constant (εr=101.6),dielectric loss (tanδ=0001 7), tunability 12.19% (1.79 kV/ mm) and temperature coefficient of dielectric constant (0.009 ℃-1) could be obtained.

KeyWords:

inorganic non-metallic materials；barium strontium titanate；dielectric property