Abstract
Low-loss ceramics in the (1 − x)(Mg 0.95Zn 0.05) 2TiO 4– xSrTiO 3 system have been prepared by the conventional mixed oxide route and their microwave dielectric properties have been investigated. A two-phase system was confirmed by the XRD patterns, the EDS analysis and the measured lattice parameters. The addition of SrTiO 3, having a smaller grain size in comparison with that of (Mg 0.95Zn 0.05) 2TiO 4, could effectively promote the densification in the (Mg 0.95Zn 0.05) 2TiO 4 matrix. The specimen using 0.94(Mg 0.95Zn 0.05) 2TiO 4–0.04SrTiO 3 sintered at 1270 °C possesses an excellent combination of microwave dielectric properties: ɛ r of ∼18, Q × f of ∼125,600 GHz (at 10 GHz), and τ f of ∼0 ppm/°C. The dielectric is proposed as a candidate material for low-loss microwave and millimeter wave applications.
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