Abstract
Orthorhombic olivine-structured LiMSiO4 (M = Ho, In) ceramics were synthesised using the solid-state reaction. Promising microwave dielectric properties of εr = 10.04, τf = 23.3 ppm/°C and a high-quality factor (Q × f) of 11,415 GHz for LiHoSiO4 were obtained at 1050 °C, and εr = 7.78, τf = −46.8 ppm/°C and Q × f = 23,390 GHz for LiInSiO4 were achieved at 1140 °C. According to the bond valence result, Ho3+ presented a slightly compressed state but Li+ and Si4+ exhibited a strong rattling state in LiHoSiO4, which led to higher εr than the εtheo. The integrated effect of rattling cations (Li+ and In3+) and a compressed cation (Si4+) in LiInSiO4 resulted in a small positive deviation Δεr. The larger packing fraction of LiInSiO4 contributed to a higher Q × f than LiHoSiO4. The Si–O bond in both ceramics played a leading role in influencing the Q × f according to the Phillips−Van Vechten−Levine chemical bond theory.
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