采用固相烧结法制备了掺杂Al2O3的Ca0.2Sr0.05 Li0.375Sm0.375TiO3微波介质陶瓷.研究了Al2O3掺杂对Ca0.2Sr0.05Li0.375Sm0.375TiO3的助烧效果、物相结构、显微组织和微波介电性能的影响规律.结果表明:Al2O3的添加降低了Ca0.2Sr0.05Li0.375Sm0.375TiO3陶瓷的烧成温度,但对物相基本无影响.此外,高含量Al2O3的添加能促进晶粒细化.此体系陶瓷的最佳介电性能为:Al2O3含量为0.9wt%且烧成温度为1250℃时,εr=110.8、Q-f=4159.6 GHz、Tr=49.4 ppm/℃.
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