Microwave dielectric properties of a new ZnTiNb2O8-(Li0.5Bi0.5)MoO4 ceramic sintered at low temperature

ZnTiNb2O8-(Li0.5Bi0.5)MoO4 multiphase ceramics were synthesized by solid-phase sintering process by compounding (Li0.5Bi0.5)MoO4 in ZnTiNb2O8. X-ray diffraction and Raman spectrum analysis indicate that the two phases have no chemical reaction and exist independently. The results of scanning electron microscopy on the surface of the samples and relative density analysis show that the liquid phase from the addition of (Li0.5Bi0.5)MoO4 is beneficial to the densification of the ceramics. For x = 0.30, the sintering temperatures of ZnTiNb2O8-(Li0.5Bi0.5)MoO4 multiphase ceramics can be diminished to 900 °C. At 900 °C, with the content of (Li0.5Bi0.5)MoO4 increasing from 0.20 to 0.40, εr of ZnTiNb2O8-(Li0.5Bi0.5)MoO4 multiphase ceramics increases, while the Q × f value decreases, and the value of τf varies from negative to near-zero successfully. The dielectric properties of 0.7ZnTiNb2O8-0.3(Li0.5Bi0.5)MoO4 multiphase ceramics sintered at 900 °C are the most appropriate: τf = − 7.03 ppm/°C, εr = 36.63 and Q × f = 11,097 GHz, which make it a promising candidate applicable to LTCC technology in microwave applications.