Tape casting and dielectric properties of Sr2ZnSi 2O7-based ceramic-glass composite for low-temperature co-fired ceramics applications

Abstract

The Sr2ZnSi2O7 ceramics sintered at 1475°C has εr=8.5, Qu× f=105,000 GHz (at 12.63 GHz), and τf=-51.5 ppm/°C. The sintering temperature of Sr2ZnSi2O7 has been lowered to 875°C by the addition of 20Li2O-20MgO-20ZnO-20B2O 3-20SiO2 (LMZBS) glass. Addition of a small amount of SrTiO3 lowered the value of τf. Tapes were cast using the composition Sr2ZnSi2O7+15 wt% LMZBS. The stacked and sintered tapes exhibited εr∼7 and tan δ∼10-3 at 290 K. The chemical compatibility of Ag with the ceramic-glass composites was also investigated. © 2010 The American Ceramic Society.