Microwave Dielectric Properties of Li ₂ TiO ₃ Ceramics Doped with ZnO–B ₂ O ₃ Frit

Abstract

A type of new low sintering temperature ceramic, Li 2 TiO 3 ceramic, has been found. Although it is difficult for the Li 2 TiO 3 compound to be sintered compactly at temperatures above 1000°C for the volatilization of Li 2 O, dense Li 2 TiO 3 ceramics were obtained by conventional solid‐state reaction method at the sintering temperature of 900°C with the addition of ZnO–B 2 O 3 frit. The sintering behavior and microwave dielectric properties of Li 2 TiO 3 ceramics with less ZnO–B 2 O 3 frit (≤3.0 wt%) doping were investigated. The addition of ZnO–B 2 O 3 frit can lower the sintering temperature of the Li 2 TiO 3 ceramics, but it does not apparently degrade the microwave dielectric properties of the Li 2 TiO 3 ceramics. Typically, the good microwave dielectric properties of ɛ r =23.06, Q × f =32 275 GHz, τ f = 35.79 ppm/°C were obtained for 2.5 wt% ZnO–B 2 O 3 frit‐doped Li 2 TiO 3 ceramics sintered at 900°C for 2 h. The porosity was 0.08%. The Li 2 TiO 3 ceramic system may be a promising candidate for low‐temperature cofired ceramics applications.