【摘要】 采用传统固相法合成了（1-x）Ca_15/16Sr_1/16TiO₃-xLi_1/2Nd_1/2TiO₃（CST-LNT）系列微波介质陶瓷材料,研究了该系列材料的物相组成、显微结构及微波介电性能。XRD分析结果表明所有样品均为钙钛矿结构,无二次相出现。随着Li_1/2Nd_1/2TiO₃的加入,陶瓷平均晶粒尺寸下降,表明Li_1/2Nd_1/2TiO₃会抑制晶粒生长。随着x的增加,介电常数下降,频率温度系数向负方向移动。当x=0.85时,1250℃保温4 h可以得到优良的微波介电性能:ε_r=125.4,Q×f=2230GHz,τ_f=+14.4 ppm/℃。更多还原

【Abstract】 (1-x)Ca_15/16Sr_1/16TiO₃-xLi_1/2Nd_1/2TiO₃（CS-LNT） ceramics were prepared by the conventional solid-state reaction method.The phases,microstructures,and microwave dielectric properties of the prepared ceramics were analyzed.The XRD results indicated that all the specimens exhibited a single perovskite structure,and no other second phase was found.The grain size of CS-LNT ceramics decreases with the increase of the content of Li_1/2Nd_1/2TiO₃,implying that Li_1/2Nd_1/2TiO₃ may suppress grain growth.As x increased,the dielectric constant of the CS-LNT ceramics reduced and the temperature coefficient of resonant frequency gradually changed from positive to negative.Excellent microwave dielectric properties of ε_r=125.4,Q×f=2230 GHz and τ_f= +14.4 ppm/℃ were obtained for 0.15Ca_15/16Sr_1/16TiO₃-0.85Li_1/2Nd_1/2TiO₃ ceramic sintered at 1250℃ for 4 h.更多还原