Microwave dielectric properties of LBBS glass added (Zn0.95Co0.05)2SiO4 for LTCC technology

The effects of Li2O-B2O3-Bi2O3-SiO2 (LBBS) glass on the sintering characteristics and microwave dielectric properties of (Zn0.95Co0.05)2SiO4 were investigated in this study. (Zn0.95Co0.05)2SiO4 powders were fabricated by traditional solid-state preparation, and LBBS glass was synthesised by quenching method. The LBBS glass can effectively reduce the sintering temperature of (Zn0.95Co0.05)2SiO4 from 1300 °C to 900 °C and thus promote the densification and uniformity of the specimens. XRD patterns indicated that no other secondary phases existed in our doping range (0-2 wt%). To obtain the highest sintering density and a uniform microstructure when the samples were sintered at 900 °C, the optimal doping content was set to be 1.5 wt%. The sample also demonstrated the following excellent microwave dielectric properties: ɛr=6.16, Qf=33,000 GHz and τf=−59 ppm/°C.