Microstructure, magnetic, and power loss characteristics of low-sintered NiCuZn ferrites with La₂O₃-Bi₂O₃ additives

Low-temperature-sintered Ni0.5Cu0.125Zn0.375Fe1.98O4 ferrites co-added with x wt% (x = 0.00-0.25 wt%) La2O3 and 0.25 wt% Bi2O3 were successfully prepared via conventional solid-phase reaction method. The phase composition, microstructure, magnetic properties, and especially power loss variation of the samples were systematically studied. The results showed that all samples possessed a single spinel phase structure at a sintering temperature of 900 & DEG;C, exhibiting high degree of densification and uniform grains. The appropriate amount of La2O3 additive improved the saturation flux density and permeability of NiCuZn ferrites, simultaneously reducing the coercivity and power loss. The maximum permeability and the lowest power loss were achieved at x = 0.15 wt%. The corresponding sample had the homogeneous microstructure and excellent magnetic properties, being a promising low-temperature co-fired ferrite candidate for magnetic power components.