ZnLi2/3Ti4/3O4: A new low loss spinel microwave dielectric ceramic

A new low loss spinel microwave dielectric ceramic with composition of ZnLi2/3Ti4/3O4 was synthesized by the conventional solid-state ceramic route. The ceramic can be well densified after sintering above 1075 °C for 2 h in air. X-ray diffraction data show that ZnLi2/3Ti4/3O4 ceramic has a cubic structure [Fd-3m (227)] similar to MgFe2O4 with lattice parameters of a = 8.40172 Å, V = 593.07 Å3, Z = 8 and ρ = 4.43 g/cm3. The best microwave dielectric properties can be obtained in ceramic with relative permittivity of 20.6, Q × f value of 106,700 GHz and τf value of −48 ppm/°C. The addition of BaCu(B2O5) (BCB) can effectively lower the sintering temperature from 1075 °C to 900 °C and does not induce much degradation of the microwave dielectric properties. Compatibility with Ag electrode indicates that the BCB added ZnLi2/3Ti4/3O4 ceramics are good candidates for LTCC applications.