Abstract: Ba2Ti9O20 ceramics were synthesized by the traditional solid-state reaction method, using BaCO3 and TiO2 as raw materials.In order to reduce the sintering temperature of Ba2Ti9O20 ceramics, liquid-phase method was used to dope Bi2O3-ZnO-B2O3(BZB) by precursor solution (BiCl3,Zn(NO3)2 and H3BO3) instead of mixing BZB powder directly with Ba2Ti9O20 ceramics.The optimal concentration of BZB was found to be 0.3 mol/L, and the derived Ba2Ti9O20 ceramic sintered at 1150 ℃ for 3 h presented good microwave dielectric properties of εr=37 and Qf=23485 GHz, which is much better than those of mixing BZB powder directly with Ba2Ti9O20 ceramics(εr=34 and Qf=16985 GHz).

Key words: microwave dielectric ceramics;solid state reaction;dielectric property;low-temperature sintered