Zn2＋掺杂对0．965MgTiO3-0．035SrTiO3微波介质陶瓷结构与性能影响研究  

Effect of Zn^(2+) Doping on the Structure and Properties of 0.965MgTiO_3-0.035SrTiO_3 Microwave Dielectric Ceramic

作　　者：王竹梅[1] 汪婷[1] 李月明[1] 沈宗洋[1] 洪燕[1] 

机构地区：[1]景德镇陶瓷学院材料科学与工程学院,江西省先进陶瓷材料重点实验室,景德镇333403

出　　处：《硅酸盐通报》2013年第3期448-452,共5页Bulletin of the Chinese Ceramic Society

基　　金：江西省教育厅科技项目(GJJ12498,GJJ10562)

摘　　要：采用固相反应法制备了0.965MgTiO3-0.035SrTiO3(MST)微波介质陶瓷,选用Zn2+对MST陶瓷进行了A位离子掺杂,研究了不同Zn2+掺杂量对陶瓷烧结性能、晶相组成、显微结构及微波介电性能的影响。结果表明,Zn2+的掺入促进了陶瓷的烧结,显著提高了陶瓷的致密度,且没有改变陶瓷的主晶相。在掺杂量小于0.04mol%范围内,随着Zn2+掺杂量的增加,陶瓷的介电常数增加,品质因素和频率温度系数略有降低。中间相MgTi2O5的衍射峰强度随着Zn2+掺杂量的增加逐渐减弱直至完全消失。当Zn2+掺杂量为x=0.03时,陶瓷的烧结温度由1380℃降低至1290℃,并呈现优异的微波介电性能:εr=22.51,Q×f=16689 GHz,τf=-4.52×10-6/℃。0. 965MgTi03-0.035SrTiO3 （MST） microwave dielectric ceramic was prepared by solid state reaction method. Zn2 ＋ was selected to cooperated into the A-site of MST ceramic, and the effect of Zn2＋ doping amount on sintering behavior, phase composition, microstruetures and microwave dielectric properties of the ceramic was investigated. The results showed that the incorporation of Zn2＋ promoted the sinterability and improved the density significantly. The main crystal phases were not changed. The dielectric constant of the ceramic increases while the quality factor and frequency temperature coefficient decrease slightly with the increase of Zn2 ＋ doping amount. The diffraction peak intensity of intermediate phase MgTi205 gradually decreases to completely disappear with Zn2＋ doping. When the Zn2＋ doping amount x = 0.03, the sintering temperature of MST ceramic reduced from 1380 ℃ to 1290 ℃, and excellent microwave dielectric properties were as follows： ετ=22.51,Q×f=16689GHz,τf=-4.52×10^-6/℃.

关 键 词：微波介质陶瓷 钛酸镁 微波介电性能 

分 类 号：TQ174[化学工程—陶瓷工业]