采用传统固相反应法,研究了烧结助剂MnCO3对0.80Sm(Mg1/2Ti1/2) O3-0.20Ca0.8 Sr0.2 TiO3微波介质陶瓷的烧结性能和介电性能的影响.结果表明,烧结助剂MnCO3的引入未改变陶瓷的晶相组成.添加适量的MnCO3可以降低体系的烧结温度,获得较优的性能;添加过量的MnCO3或烧结温度过高会产生微裂纹,增加了陶瓷的介电损耗,降低致密性.在1500℃烧结,保温3h,添加0.50wt％ MnCO3,0.80Sm(Mg1/2Ti1/2) O3-0.20Ca0.8 Sr0.2TiO3陶瓷获得最佳的介电性能:εr=29.80,Q×f=56900 GHz,(T)f=7.53 ppm℃.
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