Ultra-Low Fire Glass-Free Li3Femo3O12 Microwave Dielectric Ceramics

A new ultra-low fire glass-free microwave dielectric material was investigated for the first time. Single phase ceramics were obtained by the conventional solid-state route after sintering at 540-600 deg C. The atomic packing fraction, FWHM of the Ag oxygen-octahedron stretching Raman mode and Of values of samples sintered at different temperatures correlated well with each other. The sample with a Lower Raman shift showed a higher dielectric constant. Interestingly, the system also showed a distinct adjustable temperature coefficient of resonant frequency.