Abstract

A new low temperature cofired ceramic (LTCC) tape based on 40 wt% Al₂O₃–60 wt% LABS glass (40Li₂CO₃:10Al₂O₃:30B₂O₃:20SiO₂) has been developed. The dielectric properties of the LABS glass are studied. The structural, dielectric, thermal as well as the chemical compatibility with Ag electrode of the bulk Al₂O₃–LABS sintered at 800 °C are investigated. The room temperature thermal conductivity and CTE of the bulk are 3.80 Wm⁻¹ K⁻¹ and 5.1 ppm/°C respectively. The Al₂O₃–LABS slurry which has a pseudoplastic nature is made into thin sheets using tape casting technique. The green tape has a surface roughness of 293 nm and tensile strength 0.2 MPa. The Al₂O₃–LABS based LTCC tapes are sintered at 775 °C has εᵣ of 4.70 with tanδ 0.005 and τ_ε of +412 ppm/°C at 5 GHz. The results suggest that the Al₂O₃–LABS based LTCC tapes is a possible candidate for LTCC device applications.