Microwave dielectric properties of a new ZnTiNb 2 O 8 -(Li 0.5 Bi 0.5 )MoO 4 ceramic sintered at low temperature

ZnTiNb 2 O 8 -(Li 0.5 Bi 0.5 )MoO 4 multiphase ceramics were synthesized by solid-phase sintering process by compounding (Li 0.5 Bi 0.5 )MoO 4 in ZnTiNb 2 O 8 . 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 (Li 0.5 Bi 0.5 )MoO 4 is beneficial to the densification of the ceramics. For x = 0.30, the sintering temperatures of ZnTiNb 2 O 8 -(Li 0.5 Bi 0.5 )MoO 4 multiphase ceramics can be diminished to 900 °C. At 900 °C, with the content of (Li 0.5 Bi 0.5 )MoO 4 increasing from 0.20 to 0.40, ε r of ZnTiNb 2 O 8 -(Li 0.5 Bi 0.5 )MoO 4 multiphase ceramics increases, while the Q × f value decreases, and the value of τ f varies from negative to near-zero successfully. The dielectric properties of 0.7ZnTiNb 2 O 8 -0.3(Li 0.5 Bi 0.5 )MoO 4 multiphase ceramics sintered at 900 °C are the most appropriate: τ f = − 7.03 ppm/°C, ε r = 36.63 and Q × f = 11,097 GHz, which make it a promising candidate applicable to LTCC technology in microwave applications.