Phase compositions and microwave dielectric properties of MgTiO3-based ceramics obtained by reaction-sintering method

摘要

MgTiO3-based microwave dielectric ceramics were prepared successfully by reaction sintering method. The X-ray diffraction patterns of the sintered samples revealed a major phase of MgTiO3-based and CaTiO3 phases, accompanied with Mg2TiO4 or MgTi2O5 determined by the sintering temperature and time. The microwave dielectric properties had a strong dependence of sintering condition due to the different phase compositions and the microstructure characteristics. The ceramics sintered at 1360 A degrees C for 4 h exhibited good microwave dielectric properties: a dielectric constant of 20.3, a high quality factor of 48,723 GHz (at 9GHz), and a temperature coefficient of resonant frequency of -1.8 ppm/C-o. The obtained results demonstrated that the reaction-sintering process is a simple and effective method to prepare the MgTiO3-based ceramics for microwave applications.