采用固相反应法合成Li2ZnTi3O8,然后添加Al2O3(添加量为Li2ZnTi3O8质量的0~7%)制备Al2O3/Li2ZnTi3O8复合微波介电陶瓷,研究Al2O3添加量对复合陶瓷微观结构与介电性能的影响。结果表明,复合陶瓷主相为立方结构Li2ZnTi3O8,随Al2O3添加量增加,逐渐生成ZnAl2O4和TiO2第二相,这2种物质对陶瓷的微波介电性能有很大影响。Al2O3的添加可抑制Li2ZnTi3O8晶粒的生长。烧结温度为1 100 ℃、Al2O3添加量为1%时,Al2O3/Li2ZnTi3O8复合微波介电陶瓷获得最佳介电性能,介电常数εr ≈ 26.1,Q×f ≈ 87 900 GHz,谐振频率温度系数τf ≈ 13.3×10-6 ℃-1。
Li2ZnTi3O8 was synthesized by solid-state reaction. The microwave dielectric ceramics composed of Li2ZnTi3O8 and Al2O3 were prepared (The Al2O3 mass is 0-7% of Li2ZnTi3O8 mass). The effects of Al2O3 addition amount on the microstructures and dielectric properties of the samples were investigated. The results show that the primary phase of the composite ceramics is cubic structure Li2ZnTi3O8. ZnAl2O4 and TiO2 phases are observed with the increase of Al2O3 addition amount, which have a great influence on the microwave dielectric properties of the ceramic samples. The addition of Al2O3 can inhibit the growth of Li2ZnTi3O8 grains. When the sintering temperature is 1 100 ℃ and the Al2O3 addition is 1%, the microwave dielectric ceramics composed of Li2ZnTi3O8 and Al2O3 obtain the best dielectric properties: εr ≈ 26.1, Q×f ≈ 87 900 GHz, τf ≈13.3×10-6 ℃-1.
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