Low Temperature Sintering of BaO-R2O3-TiO2 Microwave Ceramics

• Main Authors: Chun-Yu Su, 蘇純玉
• Other Authors: Yuh-Ruey Wang
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/46949973997817285193

碩士 === 國立臺北科技大學 === 材料及資源工程系碩士班 === 91 === Sintered BaO-(La1-xNdx)2O3-4TiO2 at 1450℃ show microwave dielectric properties : εr=99, Q×f=5120GHz.However, excellent microwave dielectric properties cannot fit the requirements The objective of present work is to evaluate the glass compositions to decrease sintering temperature without influence dielectric properties. The results exhibited that Li2CO3-B2O3-SiO2 and B2O3-SiO2-ZnO were suitable additives for BaO-(La1-xNdx)2O3-4TiO2.Moreover the dielectric conatant is enhanced by the increasing relative density, and decreased by increasing the amount of glasses ,so as the Q×f values. Based on dense bulks with 10 wt% Li2CO3-B2O3-SiO2 glasses addition, the densification temperature is 1150℃ under the good microwave dielectric properties： εr＞84, Q×f＞3000.Furthermore 10wt% B2O3-SiO2-ZnO(+1wt%Na2O、K2O) added BaO-(La1-xNdx)2O3-4TiO2 can be sintered to achieve theoretical densities of 90% at 1050℃, and giveεr ＞70, Q×f＞3500. As the consequence, the sintering temperature of the BaO-(La1-xNdx)2O3-4TiO2 can be effectively lowered with glasses addition and keep the good dielectric properties for LTCC materials applied to multilayer microwave devices.