Low-Temperature Sintering and Microwave Dielectric Properties of the Li_2CO_3-Addedi Ba_2V_2O_7 Ceramics

摘要

Li_2CO_3 was added to Ba_2V_2O_7 ceramics at various contents up to 20 mol% to decrease their sintering time and temperature. The Li_2CO_3-added Ba_2V_2O_7 ceramics sintered at 750℃ for 2 h had a dense microstructure with a high density. A liquid phase, which existed as an amorphous phase after cooling, was formed during the sintering due to the melting of Li_2CO_3 and aided the densification of the specimens. The 6.0 mol% Li_2CO_3-added ceramic sintered at 750℃ showed good microwave dielectric properties of ε_r = 10.93, Q × f= 74513 GHz, and τ_f = -19.86 ppm/℃, indicating that the Li_2CO_3-added Ba_2V_2O_7 ceramic is a good candidate material for low-temperature cofired ceramics.