Abstract
(1 − x)(3MgO–Al2O3–3TiO2)–xCaTiO3 (0.1 ≤ x ≤ 0.3) composite ceramics were synthesized by a conventional solid state reaction method. The effects of CaTiO3 addition on the phase composition, microstructure and microwave dielectric properties of 3MgO–Al2O3–3TiO2 ceramics were investigated. X-ray diffraction patterns showed that the composite ceramics were made up of MgAl2O4, MgTiO3, MgTi2O5, CaTiO3 and a small amount of TiO2 phases. The addition of CaTiO3 could adjust the τ f and improve the e r values of ceramics. The optimum microwave dielectric properties of e r = 17.6, Q × f = 36606 GHz and τ f = +4.63 ppm/°C were obtained for the 0.8(3MgO–Al2O3–3TiO2) – 0.2CaTiO3 ceramics sintered at 1325 °C, which indicates that this material is a suitable material for microwave devices.
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