Low temperature sintering and microwave dielectric properties of 0.6Li2ZnTi3O8–0.4Li2TiO3 ceramics doped with ZnO–B2O3–SiO2 glass

The novel low-temperature sinterable 0.6Li 2 ZnTi 3 O 8 –0.4Li 2 TiO 3 ceramics were prepared by cofiring the mixtures of pure-phase Li 2 ZnTi 3 O 8 , Li 2 TiO 3 and ZnO–B 2 O 3 –SiO 2 glass. Li 2 ZnTi 3 O 8 and Li 2 TiO 3 phase could well coexist in the sintered samples with no second phase detected. The near-zero temperature coefficients of the resonant frequency ( τ f ) were achieved and simultaneously the desirable quality factor Q × f values could be maintained. Typically, the 0.6Li 2 ZnTi 3 O 8 –0.4Li 2 TiO 3 ceramics with 1.0   wt% ZBS addition could be well densified at only 900   °C and exhibited excellent microwave dielectric properties of ε r =25.4, Q × f =86,400   GHz and τ f =−1.0   ppm/°C, thus showing a great potential as a middle permittivity low-temperature cofired microwave dielectric material .