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中文摘要：
采用传统固相反应法，研究了Li_2CO_3掺杂对0．94Mg_2SiO_4-0.06Ca_0．9Sr_0．1TiO_3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Li_2CO_3的引入未改变陶瓷的相组成。添加适量的Li_2CO_3可以促进烧结，烧结温度由1440℃降低到1355℃，而且介电性能也得到了优化，Q×f值有明显的提高；过量Li_2CO_3的引入，降低了材料的致密性，增加了陶瓷的介电损耗。在1355℃烧结，保温3h，添加0．50wt％Li_2CO_3的0．94Mg_2SiO_4-0.06Ca_0．9Sr_0．1TiO_3陶瓷获得最佳的介电性能：εr=7．96，Q×f=96409 GHz（f=14．571GHz），Tf=＋4．62ppm／℃。
英文摘要：
The effects of Li_2CO_3 on sintering and microwave dielectric properties of 0.94Mg_2SiO_4-0.06Ca_0.9Sr_0.1TiO_3 ceramics synthesized by a traditional solid-state reaction method were investigated. The results show that the addition of Li_2CO_3 did not change the phase of ceramics. Appropriate Li_2CO_3 addition could accelerate the sintering process, which could lower the sintering temperature from 1440 ℃ to 1355 ℃. Moreover, the addition of Li_2CO_3 improve the microwave dielectric properties and the Q ×f increases apparently. The decrease in density and deterioration of Q ×f were observed in the samples with excessive Li_2CO_3. The optimal microwave dielectric properties： εr = 7.96, Q ×f= 96409 GHz（f= 14. 571 GHz） Tf = ＋ 4.62 ppm/℃ were obtained for 0.94Mg_2SiO_4-0.06Ca_0.9Sr_0.1TiO_3 doped with 0.50wt% Li_2CO_3 sintered at 1355 ℃ for 3 h.
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