A new microwave dielectric ceramics for LTCC applications: Li sub(2)Mg sub(2)(WO sub(4 )) sub(3) ceramics

A novel microwave dielectric ceramics Li sub(2)Mg sub(2)(WO sub(4 )) sub(3) (LMW) for low-temperature co-fired ceramics (LTCC) application were prepared by the conventional solid-state sintering method. Densification, phases, microstructure and microwave dielectric properties of the Li sub(2)Mg sub(2)(WO sub(4 )) sub(3) ceramics were investigated. The optimal sintering temperature of dense Li sub(2)Mg sub(2)(WO sub(4 )) sub(3) ceramic approximately ranges from 825 to 875 degree C for 3 h. The ceramic specimens fired at 875 degree C for 3 h exhibits excellent microwave dielectric properties: epsilon sub( )r= 7.72, Q f = 29,600 GHz (f = 6.0 GHz), and tau sub( )f= -15.5 ppm/ degree C. Moreover, the Li sub(2)Mg sub(2)(WO sub(4 )) sub(3) ceramics has a chemical compatibility with Ag during cofiring, which makes it a promising ceramic for LTCC technology application.