The microstructure and microwave dielectric properties of Li 2(Mg1-xAx)Ti3O 8 (A2+ = Zn, Co and x = 0.02-0.1) ceramics are investigated. The forming of solid solutions was confirmed by XRD analysis, EDX analysis, and the measured lattice parameters. It was found that a small amount of Zn- or Co-substitution for Mg had a significant effect on the Q × f of the ceramics, increasing its value by up to 260% compared to that of pure Li2MgTi3O8. The relationships between ionic polarizability, packing fraction, and microwave dielectric properties in Li 2(Mg1-xAx)Ti3O 8 ceramics are also discussed. The specimen comprising Li 2(Mg0.96Zn0.04)Ti3O8 possesses a moderate εr of 28.7, a very small τf of -3.18 ppm/°C, and an extremely high Q × f of 151,200 GHz, demonstrating a unique potential for low-loss microwave applications.
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