采用传统烧结工艺,制备了具有不同La2O3含量的镁钛镧陶瓷,并研究了La2O3组份对材料晶相构成、晶粒、晶界的演变、介电常数和品质因数的影响.结果表明,不含La2O3的钛酸镁陶瓷主晶相为Mg2TiO4,其平均晶粒尺寸>60μm;引入La2O3后,出现新晶相La0.66TiO2.99,材料的晶粒尺寸明显下降;随La2O3含量的增加,材料的介电常数线性增加,材料的品质因数Q在10GHz出现最大值(16558).
1-x)Mg2TiO4-xLa2O3 ceramics were prepared corresponding to 0≤x≤0.1 by the conventional solid-state reaction methed. Their microstructures, dielectric properties were investigated. For the sample without La2O3, its average grain size was more than 60μm. With La2O3 added, the grain sizes became smaller and new crystal phase La0.66TiO2.99 appeared. In the meantime, dielectric constants of materials increased and the quality factor Q values can be up to 16558(10GHz) at x=0.03. Besides, microstructures of materials also changed obviously.
参考文献
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