X8R型BaTiO_(3)基细晶陶瓷的制备、结构和性能  

Preparation, Structure and Properties of X8R BaTiO_(3) Based Fine-Grained Ceramics

作　　者：戴书云 钟诗琪 张欢 朱培树 李甜 刘杰 郑兴华[2] DAI Shuyun;ZHONG Shiqi;ZHANG Huan;ZHU Peishu;LI Tian;LIU Jie;ZHENG Xinghua(Fujian Basic Electronic Materials Co.,Ltd.,Longyan 366300,China;College of Materials Science and Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福建贝思科电子材料股份有限公司,龙岩366300 [2]福州大学材料科学与工程学院,福州350108

出　　处：《硅酸盐通报》2022年第12期4412-4418,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(52102126);企业委托研发项目(01802006)。

摘　　要：由于在-55~150℃存在正交-四方和四方-立方相变,相变对应的尖锐介电峰使BaTiO_(3)陶瓷介电性能难以满足X8R温度稳定性要求。本文采用50 nm的纳米BaTiO_(3)粉体和少量堇青石(MgO-Al_(2)O_(3)-SiO_(2), MAS)玻璃,制备了满足X8R介电温度特性的BaTiO_(3)基细晶陶瓷。结果表明,随着MAS玻璃的加入,BaTiO_(3)基陶瓷的室温晶体结构从四方相转变成赝立方相,平均晶粒尺寸从纯BaTiO_(3)陶瓷的1.904μm显著降低到添加0.5%(质量分数)MAS玻璃的BaTiO_(3)基陶瓷的183 nm。与此同时,BaTiO_(3)基陶瓷虽然介电常数有所下降,但是介电损耗和介电性能的温度稳定性大幅度改善。其中添加0.5%MAS玻璃的BaTiO_(3)基细晶陶瓷介电性能为:在1 kHz时室温介电常数为984,介电损耗为0.006 5,满足X8R温度特性要求。Due to the orthogonal-tetragonal and tetragonal-cubic phase transitions of BaTiO_(3) in the range of-55 ℃ to 150 ℃, the sharp dielectric peaks corresponding to these phase transitions make the dielectric properties of BaTiO_(3)ceramics difficult to meet the temperature stability requirements of X8 R. In this paper, the BaTiO_(3) based fine-grained ceramics were prepared by using 50 nm nano-BaTiO_(3) powder and a small amount of cordierite(MgO-Al_(2)O_(3)-SiO_(2), MAS) glass to meet the dielectric temperature specification of X8 R. The results indicate that the crystal structure of BaTiO_(3) based ceramics at room temperature changes from tetragonal phase to pseudo-cubic phase with the addition of MAS glass. The average grain size decreases significantly from 1.904 μm for pure BaTiO_(3) ceramics to 183 nm for BaTiO_(3) based ceramics with 0.5%(mass fraction) MAS glass. Meantime, although the dielectric constant of BaTiO_(3) based ceramics decreases, the dielectric loss and temperature stability of dielectric properties are greatly improved. When the MAS glass content is 0.5%, the dielectric properties of BaTiO_(3) based fine-grained ceramics are as follows: the dielectric constant of 984 and dielectric loss of 0.006 5 at 1 kHz and room temperature, meeting the temperature specification requirements of X8 R.

关 键 词：BaTiO_(3) X8R 介电性能 细晶 MAS玻璃 介电损耗 

分 类 号：TB34[一般工业技术—材料科学与工程]