摘要
采用传统固相反应法,研究了Li2CO3掺杂对0.94Mg2Si O4-0.06Ca0.9Sr0.1Ti O3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Li2CO3的引入未改变陶瓷的相组成。添加适量的Li2CO3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Li2CO3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3 h,添加0.50wt%Li2CO3的0.94Mg2Si O4-0.06Ca0.9Sr0.1Ti O3陶瓷获得最佳的介电性能:εr=7.96,Q×f=96409 GHz(f=14.571 GHz),τf=+4.62 ppm/℃。
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.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2015年第2期430-434,446,共6页
Journal of Synthetic Crystals
基金
长江学者和创新团队发展计划(IRT1146)
江苏高校优势学科建设工程资助项目
