LaAlO3 doped (Mg0.95Zn0.05)TiO3-CaTiO3 ceramic system with ultra-high-Q and temperature-stable characterization

The microstructures and microwave dielectric properties of 1.0 mol% LaAlO3 doped 0.95(Mg0.95-Zn0.05)TiO3-0.05CaTiO(3) 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 (tau(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 x f values of the ceramics were significantly promoted. Moreover, the sintering temperature of the ceramic can be lowered to 1200 degrees C due to the effect of LaAlO3 as well as ZnO. The optimized microwave dielectric properties with epsilon(r) similar to 22.5, Q x f value similar to 89,000 GHz and a tau(f) of similar to-6.9 x 10(-6)/degrees C were achieved for 0.95(Mg0.95Zn0.05)-TiO3-0.05CaTiO(3) sintered at 1200 degrees C for 4 h.