Microwave Dielectric Properties of Li_2WO_4 Ceramic with Ultra-Low Sintering Temperature

摘要

A new ultra-low-temperature firing microwave dielectric ceramic, Li_2WO_4 with the phenacite structure, was prepared via solid-state reaction method. The Li_2WO_4 ceramic can be well sintered at 640°-660℃, with a microwave relative permittivity ～5.5, a Q ×f value about 62000 GHz, and a negative temperature coefficient of -146 ppm/℃ at 15.7 GHz. From an X-ray diffraction analysis, the Li_2WO_4 ceramic was found to be chemically compatible with both silver and aluminum powders at 640℃. All the results indicate that the Li_2WO_4 ceramic is a promising candidate for ultra-low temperature cofired ceramic technology, especially for dielectric substrate application.