The effect of titanium compounds addition on the microwave dielectric properties of the ZnO–Nb2O5 ceramics for LTCC

Abstract

The ZnO–Nb2O5 ceramics with titanium compounds were prepared by solid state reaction method. The effect of titanium compounds addition on the densification, phase development, microstructure and microwave dielectric properties of the ZnO–Nb2O5 ceramics was investigated. Adding TiO2 to the ZnO–Nb2O5 ceramics in different order, the X-ray diffraction patterns showed that ZnTiNb2O8 was the main crystalline phase, only the minor crystalline phases were different. The TiO2 phase could not coexist with ZnNb2O6 phase, but the CaTiO3 phase could coexist with ZnNb2O6 phase. The effect of adding TiO2 in different order on the microstructures of ZnO–Nb2O5 ceramics is unconspicuous. Compared to the ZnNb2O6–0.2CaTiO3 ceramics, it is easier to lower the sintering temperature of the ZnNb2O6–1.8TiO2 ceramics by doping BaCu(B2O5). The τf values of the ZnNb2O6–1.8TiO2 ceramics and ZnNb2O6–0.2CaTiO3 ceramics can be adjusted to zero by doping opposite τf values compounds, but the two mechanisms of adjusting τf are different.