A novel low firing microwave dielectric ceramic NaCa2Mg2V3O12

Abstract A novel low-firing microwave dielectric ceramic NaCa 2 Mg 2 V 3 O 12 was prepared by the conventional solid state ceramic route. The phase composition, microstructure, and sintering behavior were investigated. The NaCa 2 Mg 2 V 3 O 12 ceramic could be well densified at around 915 °C and exhibited favorable microwave dielectric properties with a low relative permittivity of ∼10, a high quality factor ( Q Q u × f ) of ∼50,600 GHz, and a negative temperature coefficient of resonant frequency ( τ f ) of −47 ppm/°C. The NaCa 2 Mg 2 V 3 O 12 ceramic can be compatible with Ag electrode, which makes it a promising ceramic for LTCC technology application. CaTiO 3 was added into the NaCa 2 Mg 2 V 3 O 12 ceramic to obtain a near zero τ f , and 0.8NaCa 2 Mg 2 V 3 O 12 –0.2CaTiO 3 ceramic sintered at 930 °C for 4 h showed improved properties with e r =11.5, Q u × f =37,500 GHz, and τ f =2 ppm/°C.