【摘要】 采用固相法制备了（1-x）CaTiO₃-x(Li_1/2Sm_1/2)TiO₃系列微波介质陶瓷材料,研究了该体系的相组成、烧结性能和微波介电性能之间的关系.结果表明。在x=0.1～0.9mol范围内,（1-x）CaTiO₃-x(Li_1/2Sm_1/2)TiO₃体系均形成了单一的斜方钙钛矿结构;x=0.1～0.5和x=0.6～0.9组分的最佳烧结温度分别为1250和1300℃;介电常数ε_r,、无载品质因数与谐振频率乘积Qf值、谐振频率温度系数T_f均随着x的增大而减小.当x=0.7时,1300℃下保温5h烧结得到的材料的微波介电性能为:ε_r=116.5,Qf=3254GHz,T_f=42.43×10^-6/℃.更多还原

【Abstract】 (1-x)CaTiO₃-x(Li_1/2Sm_1/2)TiO₃ microwave dielectric ceramics were prepared by solid sate reaction technique.The crystal structure,sintering properties and microwave dielectric properties of the ceramics were investigated.The results show that a single orthorhombic perovskite structure forms in the x range from 0.1 to 0.9;the best sintering temperatures of （1-x）CaTiO₃-x(Li_1/2Sm_1/2)TiO₃ arc 1250℃and 1300℃in the x range from 0.1 to 0.5 and 0.6 to 0.9,respectively;the dielectric constantε_r,the product of quality factor and resonance frequency （Qf） value and the temperature coefficient of resonant frequencyτ_f decrease with the increasing of x.The Ca_0.3(Li_1/2Sm_1/20.7TiO₃ ceramic sintered at 1300℃for 5h exhibits excellent microwave dielectric properties:ε_r=116.5,Qf=3254GHz,τ_f= 42.43×10^-6/℃.更多还原