Dongjin Chu

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

A new low sintering temperature microwave dielectric ceramic, Li 2 ZnTi 3 O 8 , was investigated. X-ray diffraction data show that Li 2 ZnTi 3 O 8 has a cubic structure [P4332(212)] with lattice parameters a = 8.37506 A, V = 587.44 A 3 , and Z = 4 when the sintering temperature is 1050 °C. The Li 2 ZnTi 3 O 8 ceramic exhibits good microwave dielectric properties with e r about 26.2, Q×f value about 62,000 GHz, and τ f about −15 ppm/°C. The addition of BaCu(B 2 O 5 ) 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.