Effects of BaCu(B2O5) addition on microwave dielectric properties of Li2TiO3 ceramics for LTCC applications

Abstract

Abstract BaCu(B 2 O 5 ) (BCB) was used in this study to reduce the sintering temperature of Li 2 TiO 3 . BCB effectively regulated the τ f value of low-temperature co-fired ceramic (LTCC) materials. X-ray diffraction patterns indicated that only the Li 2 TiO 3 phase occurred within the doping range of 1 wt%–3.5 wt%. Scanning electron microscopy images showed compact and uniform grains in the samples with 2.0 wt% BCB. The samples also obtained the highest density and excellent microwave dielectric properties when sintered at 900 and 950 °C (i.e., ɛ r = 15.19 and Qf = 58,084 GHz at 900 °C; ɛ r = 15.21 and Qf = 58,143 GHz at 950 °C, respectively). BCB also effectively reduced the τ f values of Li 2 TiO 3 (e.g., τ f = 15.23 ppm/°C with 2.0 wt% BCB and τ f = 9.95 ppm/°C with 4.0 wt% BCB). The materials prepared with BCB were chemically compatible with silver and showed potential in LTCC applications.