Abstract
High-Q Li2MgxTiO3+x (2.2≤x≤4) microwave dielectric ceramics were fabricated by using a conventional solid-state reaction method followed by laminated sintering technique. All samples showed clear and smooth grains through this sintering method. The XRD patterns indicated that Li2MgxTiO3+x (2.2≤x≤4) ceramics displayed MgO-like cubic phase with ordered rock salt structure. The dielectric constant decreased monotonically because the molar volume expanded and molecular polarizability decreased when x values increased. The Q×f values of Li2MgxTiO3+x (2.2≤x≤4) ceramics were dependent significantly on both average grain sizes and packing fraction. The Li2Mg3.6TiO6.6 ceramics sintered at 1375°C had excellent microwave dielectric properties of εr∼12.7, Q×f∼169,000GHz, τf∼−32.8ppm/°C.
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