Effects of LiF on microwave dielectric properties of 0.25Ca0.8Sr0.2TiO3–0.75Li0.5Nd0.5TiO3 ceramics

被引：0
作者：
FEI LIU
CHANGLAI YUAN
XINYU LIU
JING JING QU
机构：
[1] Central South University,College of Material Science and Engineering
[2] Guilin University of Electronic Technology,College of Material Science and Engineering
[3] Guilin University of Aerospace Technology,Department of Information Engineering
来源：
Bulletin of Materials Science | 2015年 / 38卷
关键词：
0.25Ca; Sr; TiO; –0.75Li; Nd; TiO; microwave dielectric properties; microstructures; LiF.;
D O I：
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中图分类号：
学科分类号：
摘要：
The effects of LiF addition on sinterability, microstructure and microwave dielectric properties of 0.25Ca0.8Sr0.2TiO3–0.75Li0.5Nd0.5TiO3 ceramics were investigated. The LiF addition enhanced the sintering temperature of 0.25Ca0.8Sr0.2TiO3–0.75Li0.5Nd0.5TiO3 ceramics from 1200 to 1300°C, because the LiF addition could compensate the evaporation of Li during the sintering process. It was found that the bulk density and dielectric constant ( εr) gradually decreased, the quality factor (Qf) greatly increased and the temperature coefficient of resonant frequency (τf) shifted to a near-zero value with the increase in LiF addition. Obviously, excess Li addition could efficiently improve the microwave dielectric properties. In addition, 0.25Ca0.8Sr0.2TiO3–0.75Li0.5Nd0.5TiO3 + 4.0 wt% LiF ceramics sintered at 1350 ∘C for 4 h exhibited good microwave dielectric properties of εr∼123.4,Qf∼ 2209 GHz (at 2.43 GHz) and τf∼ 12.3 ppm ∘C–1.
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页码：1223 / 1229
页数：6
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