Co取代对Nd(Zn_0.5Ti_0.5)O₃微波介质陶瓷结构与性能的影响

Nd[(Zn_1-xCo_x)_0.5Ti_0.5]O₃ (0≤x≤0.9) microwave dielectric ceramics were prepared by a conventional solid-state route. The effects of Co²⁺ B-site substitution Zn²⁺ on the structure and microwave dielectric properties of Nd(Zn_0.5Ti_0.5)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 ε_r decreased gradually and the temperature coefficient of resonant frequency τ_f moved to a positive tendency with the increase of Co substitution. The quality factor Q×f initially increased to a maximum value of 215130 GHz at x=0.3 mol and thereafter declined. The substantial rise of Q×f might be attributed to the improvement of B-site cation ordering. Nd[(Zn_0.7Co_0.3)_0.5Ti_0.5]O₃ ceramics had good microwave dielectric properties sinteringat 1410℃ for 4 h, ε_r=31.2, Q×f=215130 GHz, τ_f=-35.7×10^-6℃^-1.