Abstract:
0.7Ba(Al
0.98Co
0.02)
2Si
2O
8-0.3Ba
5Si
8O
21(BACS-BS)-based microwave dielectric ceramic was prepared by traditional solid-state reaction method. The effects of Li
2O-B
2O
3(1wt%)(L-B) sintering aids on the microstructure, phase composition and microwave dielectric properties were investigated. Deviation between theoretical and experimental permittivity of 0.7BACS-0.3BS+1wt%(L-B) ceramic was discussed. The results show that adding 1wt%(L-B) sintering aids could decrease the sintering temperature of BACS-BS-based to 950 ℃. However, it apparently degrades the microwave dielectric properties. 0.7Ba(Al
0.98Co
0.02)
2Si
2O
8−0.3Ba
5Si
8O
21+1wt%(Li
2O-B
2O
3) ceramic could be well-sintered at 950 ℃ and show good microwave dielectric properties:
εr=7.56,
Q×
f=13 976 GHz,
τf=−6.32 ppm/℃. The good chemical compatibility between the ceramic and Ag electrodes was exhibited, which made it be a promising candidate for the practical applications of LTCC materials.