LiCa3ZnV3O12: A novel low-firing, high Q microwave dielectric ceramic

Abstract A novel low-firing microwave dielectric ceramic LiCa 3 ZnV 3 O 12 with low dielectric loss was synthesized by the solid-state reaction method. The phase composition, microstructure, and sintering behavior were investigated. The LiCa 3 ZnV 3 O 12 ceramic could be well densified at around 900 °C and exhibited favorable microwave dielectric properties with a low relative permittivity ( e r ) of 11.5, a fairly high quality factor ( Q u f ) of 81,100 GHz, and a negative temperature coefficient of resonant frequency ( τ f ) approximately −72 ppm/°C. The LiCa 3 ZnV 3 O 12 ceramic can be co-fired with Ag electrode, which makes it a promising ceramic for low temperature co-fired ceramic (LTCC) applications as substrate. Furthermore, 0.8LiCa 3 ZnV 3 O 12 –0.2CaTiO 3 ceramic sintered at 925 °C for 4 h exhibited improved microwave dielectric properties of e r =13.2, Q u f =59,600 GHz, and τ f =1.3 ppm/°C.