Ln(B_(1/2)Ti_(1/2))O_3型微波介质陶瓷的研究进展

Research Progress in Ln(B_(1/2)Ti_(1/2))O_3-type Microwave Dielectric Ceramics

综述了Ln(B1/2Ti1/2)O3(B=Mg,Zn,Co)型微波介质陶瓷的结构、低温烧结及改性研究现状.少量烧结助剂可有效降低陶瓷的烧结温度,但有时会恶化品质因数(Q×f).离子取代可显著提高Q×f值,对谐振频率温度系数(τf)无明显影响;而复合改性则可有效调节τf值至近0.最后探讨了Ln(B1/2Ti1/2)O3型微波介质陶瓷研究中存在的问题和未来的发展趋势,简化和优化合成工艺、实现低温烧结和调节谐振频率温度系数、加强低温烧结、离子取代和复合改性的机理研究是未来重要的研究方向.

The research progress in crystal structure, low-temperature sintering and modification of Ln（B1/2Ti1/2）O3-type （B=Mg, Zn, Co） microwave dielectric ceramics is reviewed. A small amount of sintering aids can effectively reduce the sintering temperature, whilst it sometimes deteriorates the quality factor （Q×f） of the ceramics. Ion substitution can improve the Q×f value significantly, but it has no discernible effect on the temperature coefficient of resonant frequency （τf）. Composite modification can adjust τf to a near-zero value easily. Finally, some existing problems and development trends in this field are analyzed. Simplifying and optimizing the preparation process, realizing the low-temperature sintering and adjusting re, and enhancing the mechanism studies on the low-temperature sintering, ion substitution and composite modification will be the important subjects in the future research on Ln（B1/2Ti1/2）O3 ceramics.