Influence of Ag doping on the dielectric and magnetic properties of LiFe₅O₈ ceramics

A novel spinel Li_1-xAg_xFe₅O₈ (0 ≤ x < 0.2) solid solution ceramics were fabricated via solid state reaction method. Based on XRD and SEM analysis, it was found that the spinel solid solution was formed in limited composition range. Both the dielectric and magnetic properties have been improved a lot, and the Li_0.95Ag_0.05Fe₅O₈ sample achieved the higher the real part of both permittivity and permeability as 170 and 47.1, respectively at 200 MHz and 20 MHz, which was attributed to the Ag⁺ substitutions. Considering its dielectric and magnetic properties, the Li_1-xAg_xFe₅O₈ (0 ≤ x < 0.2) ceramics provide a way in developing multifunctional materials for multifunctional electronic devices applications.