Abstract
This study presents the synthesis of LiYMo2O8 ceramic through a solid-state reaction. XRD analysis reveals a tetragonal structure (I41/a space group) for the LiYMo2O8 phase. The sample sintered at 800 °C achieved a maximum relative density of 95.8 % and exhibited excellent microwave properties: εr = 15.7, Q × f = 24380 GHz, and τf = 147.6 ppm/ °C. The results demonstrate a positive correlation between the relative density and both εr and Q × f, while Q × f and τf are found to be associated with packing fraction and Mo-O bond valence, respectively. The microwave dielectric properties are predominantly influenced by the Mo-O bond, as supported by the P-V-L theory and Raman spectroscopy analysis. Furthermore, the study reveals a correlation between εr and the ionicity of chemical bonds, a significant impact of lattice energy on Q × f, and a relationship between τf and bond energy and thermal expansion coefficient.
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