Microwave dielectric properties of glass–ceramic composites for low temperature co-firable ceramics

The densification behavior and the microwave dielectric properties of RBS–(MgCa)TiO3 (R: MgO, CaO, SrO or BaO, B: B2O3 and S: SiO2) glass–ceramic composite materials were systemically examined. The BaBS glass materials possess highest dielectric constant (K) and quality factor (Q) among the RBS glass materials and the BaBS–(Mg,Ca)TiO3 composites materials also exhibited largest K- and Q-value among the RBS–(Mg,Ca)TiO3 glass–ceramic composite materials. Comparison on the measured K-(Q-) values from the calculated K-(Q-) composition lines implies that the formation of additional crystalline phase other than (Mg,Ca)TiO3 materials markedly modifies the Q-value, but is insignificantly altering the K-value for the composite materials.