A novel high hardness and low loss Mg5Ga2Sn2O12 ceramic with spinel-structure

Inorganic oxides with a spinel structure play an indispensable role in various applications because of their stability and exceptional performance. This study prepared Mg5Ga2Sn2O12 ceramics using the solid-state method. TEM analysis reveals that the ceramics show local lattice distortions. When the sintering temperature is 1480 degrees C, the relative density and Vickers hardness of Mg5Ga2Sn2O12 ceramics are 96.8 % and 12.58 GPa, respectively. The Mg5Ga2Sn2O12 ceramics exhibit optimum microwave dielectric properties, with epsilon(r) = 8.57, Q x f = 138,769 GHz, and tau(f) = -24.7 ppm/degrees C. Far-infrared fitting shows that the vibration mode in the low-wave number region has a significant influence on the dielectric properties of ceramics. The P-V-L theory indicates that the Sn-O bond has the most significant influence on epsilon(r) and Q x f. Given these advantages, Mg5Ga2Sn2O12 ceramics hold promise for applications in low-loss dielectric materials.