Low-Temperature Sintering and Microwave Dielectric Properties of Li_2ATi_3O_8 (A = Mg, Zn) Ceramics

摘要

New temperature-stable low-loss ceramic-glass composites based on Li_2ATi_3O_8 (A = Mg, Zn) ceramics have been prepared by the conventional solid-state ceramic route. The effect of lithium magnesium zinc borosilicate (LMZBS) glass addition on the sinterability, phase purity, microstructure, and microwave dielectric properties of Li_2MgTi_3O_8 (LMT) and Li_2ZnTi_3O_8 (LZT) dielectric ceramics has been investigated for low-temperature co-fired ceramic applications. The LMT+3wt% of LMZBS glass sintered at 925℃/4 h has ε_r = 24.5, Q_u ×f = 44,000 GHz, and τ_f= ( + )0.2 ppm/℃. Addition of LZT ceramics with 3 wt% of LMZBS glass sintered at 900℃/4 h has ε_r = 23.2, Q_u × f= 31,300 GHz, and τ_f = (-) 15.6 ppm/℃. The LMT and LZT ceramic-glass composites do not react with the commonly used silver electrode material.