A new low-loss microwave dielectric ceramic for low temperature cofired ceramic applications

A new low sintering temperature microwave dielectric ceramic, Li₂ZnTi₃O₈, was investigated. X-ray diffraction data show that Li₂ZnTi₃O₈ has a cubic structure [P4332(212)] with lattice parameters a = 8.37506 Å, V = 587.44 ų, and Z = 4 when the sintering temperature is 1050 °C. The Li₂ZnTi₃O₈ ceramic exhibits good microwave dielectric properties with ε_r about 26.2, Q×f value about 62,000 GHz, and τ_f about −15 ppm/°C. The addition of BaCu(B₂O₅) can effectively lower the sintering temperature from 1050 to 900 °C without degrading the microwave dielectric properties. Compatibility with Ag electrode indicates this material can be applied to low temperature cofired ceramic devices.