Microwave Dielectric Characterization of a Li 3 NbO 4 Ceramic and Its Chemical Compatibility with Silver

A Li 3 NbO 4 ceramic has been prepared using the solid‐state reaction method and well sintered at around 930°C. The best microwave dielectric properties were obtained in the ceramic sintered at 930°C for 2 h with permittivity 15.8, Qf value about 55 009 GHz, and temperature coefficient about −49 ppm/°C. From X‐ray diffraction, backscattered electron imaging, and energy‐dispersive X‐ray spectroscopy results of the ceramic co‐fired with 20 wt% silver additive, the Li 3 NbO 4 ceramic was found not to react with Ag at 900°C. The Li 3 NbO 4 ceramic is a promising dielectric material for low‐temperature co‐fired ceramic technology.