Microstructure Modifications and Sintering Mechanism of B a _0.55 S r _0.4 C a _0.05 T i O ₃ Ceramics Containing Different M g O Additive for LTCC Application

Ferroelectric B a _0.55 S r _0.4 C a _0.05 T i O ₃ ( BSCT ) ceramics with nano‐ M g O additive have been prepared by typical electrical ceramic technology sintered at 950°C for 2 h. The influence of the additive content on the sintering behaviors of BSCT ceramics is investigated. The results show that the interactions of M g O with BSCT and B ₂ O ₃ ‐ L i ₂ O liquid sintering additive help to form wetting boundaries for accelerating densification process, promote the grain growth of BSCT ceramic. The BSCT ceramic with 20 wt% nano‐ M g O possesses uniform microstructure, high densification, and superior dielectric properties. The modification mechanism of nano‐ M g O on BSCT ceramic is summarized as “ M g O assisted wetting sintering model.”