Microstructural development on sol–gel derived cordierite ceramics doped B2O3 and P2O5

The microstructure of sol–gel derived cordierite doped B2O3 and P2O5 was investigated in this study. This kind of material had a low dielectric constant, low dissipation factor and can be co-fired with high conductivity metals such as Au, Ag/Pd, Cu paste at low temperature (below 1000 °C), suggesting that it would be a promising material for high-frequency MLCIs. This paper focused on the crystallizing process from MASBP glass phase including crystallizing temperature, the size and morphology of the crystals and the growth direction of a bar crystal. The experimental results showed that crystallizing phases were α-cordierite and the growth direction of a bar crystal was about [−6 9 −3 0], by a 14° angle with an axis.