研究了(1-x)(Mg0.9Co0.1)TiO3-x(Ca0.61La0.26)TiO3(MCT-CLT)体系陶瓷的微波介电性能. 目的是通过(Ca0.61La0.26)TiO3 (CLT)协调(Mg0.9Co0.1)TiO3(MCT)陶瓷的谐振频率温度系数. 实验发现, 烧结温度和陶瓷组成对微波介电性能影响显著, 当烧结温度为1300℃时, 可以获得良好的致密度, 当烧结温度超过1300℃时, 陶瓷致密度和介电性能下降. 此外, 随着CLT含量的增加, 材料的介电常数增大, 品质因数减小. 当CLT含量为13%, 烧结温度为1300℃, 保温2h, (MCCLT)陶瓷具有优良微波介电性能, εr =22.4, Q×f =35000 GHz, τf = -8.7×10-6/℃, 从而达到实用要求.
The microwave dielectric properties of the (1-x)(Mg0.9Co0.1)TiO3-x(Ca0.61La0.26)TiO3(MCT-CLT) ceramics were investigated. The system was prepared using a conventional solid-state ceramic route. The objective of the present work is to compensate for the negative temperature coefficient of resonant frequency (τf) of (Mg0.9Co0.1)TiO3 (MCT) by the addition of (Ca0.61La0.26)TiO3 (CLT). The microwave dielectric properties are strongly correlated with the sintering temperature and the composition. Very dense MCT-CLT ceramics were prepared by sintering at 1300℃. When the ceramics were sintered at temperatures above 1300℃, the bulk density decreased and the dielectric properties deteriorated. With the increasing of x, the relative dielectric constant (εr) of the ceramics increases and the product of quality factor and resonant frequency (Q×f) decreases. For practical application, 0.87(Mg0.9Co0.1)TiO3- 0.13(Ca0.61La0.26)TiO3 (87MCT-13CLT) ceramics sintered at 1300℃ with a dielectric constant εr=22.4, a Q×f value of 35000 GHz and a temperature coefficient of resonance frequency (τf) of -8.7×10-6/℃ was proposed in this paper.
参考文献
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