Abstract
In this study, the effect of Zn2+ ions non-stoichiometry on the crystal structure, densification, microstructure, ionic polarizability and microwave dielectric properties of Li2ZnTi3O8 ceramics were investigated. The non-stoichiometric Li2Zn1+xTi3O8 compositions (−0.04≤x≤0.06) were prepared by the conventional solid state ceramic route. The evolution of the unit cell parameter and cation ordering were investigated employing XRD. The elemental analysis and microstructure of Li2Zn1+xTi3O8 specimens were studied by EDX and SEM, respectively. It was found that a slight Zn2+ ions excess improves density and microwave dielectric properties, while the deficiency of Zn2+ ions brings deterioration of the properties. When x = 0.06, well relative density of 95.1%, uniform grains in microstructure without any second phase and best microwave dielectric properties of εr = 25.5, Q × f = 63000 GHz, τf = −18 ppm/°C were achieved in non-stoichiometric Li2Zn1.06Ti3O8 ceramic rather than other non-stoichiometric and stoichiometric compositions.
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