本实验研究了(1- x)(Mg0.7Zn0.3)TiO3– x(Ca0.61La 0.26 )TiO3(MZT-CLT)系陶瓷的微观结构和微波介电性能, 通过(Ca0.61La 0.26 )TiO3来协调(Mg0.7Zn0.3)TiO3陶 瓷 的谐振频率温度系数. MZT-CLT陶瓷的主晶相为(Mg0.7Zn0.3)TiO3, 第二相为Ca0.61La0.26TiO3和(Mg0.7Zn0.3)Ti2O5. 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 1275℃ 时, 可以获得良好的致密度, 当烧结温度超过 1300℃ 时, Zn的蒸发导致陶瓷致密度和介电性能下降. 随着(Ca0.61La 0.26 )TiO3含量的增大, 材料的介电常数增大, 品质因数减小. 当 x =0.13, 烧结温度为 1275℃ 保温4h, (MZT-CLT)陶瓷具有优良微波介电性能,ε r =26,Q·f =86000 GHz,τ f = -6×10 - 6 /℃.
The microstructures and the microwave dielectricproperties of the (1? x)(Mg0.7Zn0.3)TiO3- xCa0.61La0.26TiO3(MZT-CLT) ceramic system were investigated. The objective of the presentwork is to compensate for the negative temperature coefficient of resonantfrequency of (Mg0.7Zn0.3)TiO3 by the additionof (Ca0.61La0.26)TiO3. MZT-CLTceramics exhibited mixed phases of (Mg0.7Zn0.3)TiO3as the main phase associated with minor phases of Ca0.61La0.26TiO3 and (Mg0.7Zn0.3)Ti2O5.The microwave dielectric properties are strongly correlated with the sinteringtemperature and the composition. Very dense MZT-CLT ceramics were synthesizedby sintering at1275 ℃. When the samples were sintered at temperaturesabove1300 ℃, the evaporation of Zn resulted the decrease indensity and degradation in dielectric properties. With the increasing of x, the relative dielectric constant ( εr) of the ceramicsincreases and the product of quality factor and resonant frequency ( Q · f) decreases. The εr, Q· fand temperature coefficient of resonant frequency ( τf) of 0.87(Mg0.7Zn0.3)TiO3-0.13Ca0.61La0.26TiO3ceramic sintered at1275℃ are 26, 86000 GHz and -6×10 - 6 /℃, respectively.
参考文献
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