Bond, vibration and microwave dielectric properties of LiYMo2O8 ceramics with low sintering temperature

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 degrees C achieved a maximum relative density of 95.8 % and exhibited excellent microwave properties: er = 15.7, Q x f = 24380 GHz, and zf = 147.6 ppm/ degrees C. The results demonstrate a positive correlation between the relative density and both er and Q x f, while Q x f and zf 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 er and the ionicity of chemical bonds, a significant impact of lattice energy on Q x f, and a relationship between zf and bond energy and thermal expansion coefficient.