李玉平1,郭爱芬1,高应霞1,陈功田2.Li2Mg2.95M0.05TiO6(M=Mg,Zn,Co,Ca)型 微波介质陶瓷介电性能研究[J].湖南大学学报:自然科学版,2019,(12):79~84
Li2Mg2.95M0.05TiO6(M=Mg,Zn,Co,Ca)型 微波介质陶瓷介电性能研究
Study on Dielectric Properties of Microwave Dielectric Ceramics Li2Mg2.95M0.05TiO6(M=Mg,Zn,Co,Ca)
  
DOI:
中文关键词:  离子掺杂  微波介质陶瓷  介电常数  品质因素  谐振温度系数
英文关键词:ion doping  microwave dielectric ceramics  dielectric constant  quality factors  resonant temperature coefficient
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作者单位
李玉平1,郭爱芬1,高应霞1,陈功田2 (1. 湖南大学 材料科学与工程学院湖南 长沙 410082 2. 郴州功田电子陶瓷技术有限公司湖南 郴州 423000) 
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中文摘要:
      采用一步法制备了Li2Mg2.95M0.05TiO6(M为Mg,Zn,Co,Ca)型微波介质陶瓷,讨论了掺杂离子种类对陶瓷烧结行为、组成、微观结构和微波介电性能的影响. 结果表明:所得陶瓷样品的主晶相为Li2Mg3TiO6,掺加Mg2+的样品有少量Mg2TiO4杂质相;掺加Ca2+的样品可形成介电常数(εr)高达170,温度系数(τf)达+800×10-6/℃且能够与主晶相共存形成稳定复合体系的CaTiO3;掺Ca2+的样品在1 370 ℃保温6 h,可得到介电常数(εr)为16.7,品质因数(Q × f)为83 900 GHz,谐振温度系数(τf)接近于0 × 10-6/℃的最佳介电性能的样品.
英文摘要:
      A series of Li2Mg2.95M0.05TiO6(M for Mg,Zn,Co,Ca) microwave dielectric ceramics were prepared by one-step reaction method,and the effects of doped ion on ceramic sintering behavior,composition,microstructure and microwave dielectric properties were discussed. The results showed that the main crystal phase of the obtained ceramic sample was Li2Mg3TiO6. There was a little Mg2TiO4 impurity phase when Mg2+ was doped. The ceramic doped with Ca2+ generated the phase CaTiO3 which had large dielectric constant(εr) up to 170,temperature coefficient(τf) up to +800×10-6/℃. The phase CaTiO3 coexisted with Li2Mg3TiO6 phase and formed a stable complex system. The samples mixed with Ca2+ and sintered for 6 h at 1 370 ℃ demonstrated better dielectric properties: the dielectric constant(εr) is 16.7,the quality factor(Q×f) is 83 900 GHz,and the resonant temperature coefficient(τf) is close to 0 ×10-6/℃.
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