Abstract
The microstructures and microwave dielectric properties of 1.0 mol% LaAlO3 doped 0.95(Mg0.95Zn0.05)TiO3–0.05CaTiO3 ceramics prepared by the conventional solid-state reaction route were investigated, for achieving a material with a high quality factor and nearly zero temperature coefficient of resonant frequency (τ f ). The crystalline phases and the microstructures of the ceramics were characterized by means of X-ray diffraction and scanning electron microscopy. By Zn substitution, the Q × f values of the ceramics were significantly promoted. Moreover, the sintering temperature of the ceramic can be lowered to 1200 °C due to the effect of LaAlO3 as well as ZnO. The optimized microwave dielectric properties with er ~ 22.5, Q × f value ~89,000 GHz and a τ f of ~−6.9 × 10−6/°C were achieved for 0.95(Mg0.95Zn0.05)TiO3–0.05CaTiO3 sintered at 1200 °C for 4 h.
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