Co取代对Nd(Zn0.5Ti0.5)O3微波介质陶瓷结构与性能的影响

Effects of Co Substitution on Structure and Microwave Dielectric Properties of Nd(Zn0.5Ti0.5)O3 Ceramics

采用传统固相法制备Nd[（Zn1-xCox）0.5Ti0.5]O3（0≤x≤0.9）微波介质陶瓷,研究Co^2＋在B位取代Zn^2＋对Nd（Zn0.5Ti0.5）O3微波介质陶瓷的结构和微波介电性能的影响.结果表明,在研究的组分范围内,Nd[（Zn1-xCox）0.5Ti0.5]O3陶瓷均能形成单斜钙钛矿型固溶体,随Co取代量增加,陶瓷的相对介电常数er逐渐减小,谐振频率温度系数tf逐渐向负值移动,品质因数Q×f先增大后下降,在x=0.3 mol时达到最大值215130 GHz,Q×f大幅增加是有序度作用所致.在1410℃下烧结4 h,Nd[（Zn0.7Co0.3）0.5Ti0.5]O3陶瓷具有优异的微波介电性能,ετ=31.2,Q×f=215 130 GHz,η=-35.7×10^-6℃^-1.

Nd[（Zn1-xCox）0.5Ti0.5]O3（0≤x≤0.9） microwave dielectric ceramics were prepared by a conventional solid-state route. The effects of Co^2＋ B-site substitution Zn^2＋ on the structure and microwave dielectric properties of Nd（Zn0.5Ti0.5）O3 ceramics were extensively investigated. The results showed that a solid solution with the monoclinic perovskite structure was formed in the investigated compositional range. The relative dielectric constant ετ decreased gradually and the temperature coefficient of resonant frequency rf moved to a positive tendency with the increase of Co substitution. The quality factor Qxf initially increased to a maximum value of 215130 GHz at x-=0.3 mol and thereafter declined. The substantial rise of Qxfmight be attributed to the improvement of B-site cation ordering. Nd[（Zn0.7Co0.3）0.5Ti0.5]O3 ceramics had good microwave dielectric properties sinteringat 1410 ℃ for 4 h, ετ=31.2, Q×f=215130 GHz, η=-35.7×10^-6℃^-1.