Low-Temperature Sintering and Microwave Dielectric Properties of Li2O-3ZnO-5TiO2 Ceramics Doped with B2O3

Phase composition, crystal structure as well as microwave dielectric properties of Li2O-3ZnO-5TiO(2) ceramics (LZT135, for short) with the addition of B2O3 and TiO2 were investigated. X-ray diffraction (XRD) and energy-dispersive spectroscopy (EDS) results revealed that the samples with added B2O3 and sintered at 900 degrees C had formed solid solutions with a similar crystal structure to Zn2Ti3O8. When 0.25 wt% B2O3 was added, LZT135 ceramics could be densified at about 900 degrees C, while the negative tau(f) value of about -31.5 ppm/K restricted its applications. TiO2 was added for further adjustment of the tau(f) value of LZT135 ceramics. Finally, with the addition of 0.25 wt% B2O3 and 9 wt% TiO2, near zero tau(f) values of about -0.5 ppm/K can be achieved for LZT135 ceramics, and at the same time, high Qf values of about 48 300 GHz are attractive for low-temperature co-firing ceramics technology.