Abstract (1-x)Li2(Mg0.96Ni0.04)SiO4+xLiZn0.93Co0.07PO4 composite ceramics were synthesised through solid-state reaction, and their sintering kinetics, microstructure and microwave dielectric properties were investigated. The perfect disconnection model was applied to explain the variation in grain growth with different x values and sintering temperatures. X-ray diffraction, scanning electron microscopy, thermo-mechanical analysis and network analysis were used to determine the macro and micro properties of the composite ceramics. Results showed that LiZn0.93Co0.07PO4 ceramic could promote grain growth and grain boundary modification, due to the different levels of shear stress and free energy density of the Si-rich and P-rich phases. The shrinkage onset point of the composite ceramics was adjusted to achieve full densification at 900 °C. The peak microwave dielectric properties are er = 5.78, Q × f = 48,168 GHz at 16 GHz and τf = −44.7 ppm/°C when x = 0.5, sintering temperature is 900 °C and relative density is 96.1%. Therefore, mixing LiZn0.93Co0.07PO4 (pre-sintered) and Li2(Mg0.96Ni0.04)SiO4 (pre-sintered) ceramics is a feasible synthesis method for microwave dielectric materials with excellent sintering and dielectric properties.

中文翻译：

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无助烧结剂低温烧结高性能微波介电复合陶瓷

摘要 通过固相反应合成了(1-x)Li2(Mg0.96Ni0.04)SiO4+xLiZn0.93Co0.07PO4复合陶瓷，研究了其烧结动力学、微观结构和微波介电性能。应用完美断开模型来解释晶粒生长随不同 x 值和烧结温度的变化。X射线衍射、扫描电子显微镜、热机械分析和网络分析被用来确定复合陶瓷的宏观和微观性能。结果表明，LiZn0.93Co0.07PO4陶瓷可以促进晶粒生长和晶界改性，这是由于富Si相和富P相的剪切应力和自由能密度不同。调整复合陶瓷的收缩起始点以在 900°C 下达到完全致密化。峰值微波介电特性为 er = 5.78，Q × f = 48,168 GHz 在 16 GHz 和 τf = -44.7 ppm/°C 当 x = 0.5，烧结温度为 900 °C，相对密度为 96.1%。因此，混合LiZn0.93Co0.07PO4（预烧结）和Li2（Mg0.96Ni0.04）SiO4（预烧结）陶瓷是制备具有优异烧结和介电性能的微波介电材料的可行合成方法。