(1-x)Ca0.61La0.26TiO3-xLa(Mg0.5Ti0.5)O3陶瓷的微波烧结及微波介电性能研究

Microwave dielectric properties of(1-x)Ca0.61La0.26TiO3-xLa(Mg0.5Ti0.5)O3 ceramics prepared by microwave sintering

采用微波烧结制备(1-x)Ca0.61La0.26TiO3-xLa(Mg0.5Ti0.5)O3[x=0.35~0.60,(1-x)CLT-xLMT]微波介质陶瓷,研究烧结工艺和成分配比对其物相组成、显微结构和微波介电性能的影响。结果表明,与常规烧结相比,(1-x)CLT-xLMT陶瓷的微波烧结温度低100℃,烧结时间缩短5/6;(1-x)CLT-xLMT陶瓷均形成了钙钛矿结构,随着x的增大其介电常数ε呈下降的趋势,Qf值则先增大至28038 GHz后降至6940 GHz,谐振频率温度系数τf不断减小。当x=0.40时其综合微波介电性能较佳:ε=47、Qf=19257 GHz、τf=7.9×10-6/℃,(1575℃,30 min)。可应用于移动通讯领域。

(1-x)Ca0.61La0.26TiO3-xLa(Mg0.5Ti0.5)O3[x=0.35-0.60,(1-x)CLT-xLMT]microwave dielectric ceramics were prepared by microwave sintering.The effects of sintering process and composition ratio on its phase composition,microstructure and microwave dielectric properties were studied.The results show that the microwave sintering temperature of(1-x)CLT-xLMT ceramics was 100℃lower than that of conventional sintering temperature,and the sintering time was shortened by 5/6.(1-x)CLT-xLMT ceramics have formed perovskite structures.With the increase of x,the dielectric constantεshowed a downward trend,the Qf value first increased to 28038 GHz and then decreased to 6940 GHz,and the temperature coefficient of resonance frequencyτf kept decreasing.The excellent comprehensive microwave dielectric properties ofε=47,Qf=19257 GHz andτf=7.9×10-6/℃could be obtained when x=0.40,1575℃and 30 min.It could be used in the field of mobile communications.