Synergistic effect of V2O5 and Bi2O3 on the grain boundary structure of high-frequency NiCuZn ferrite ceramics

High-frequency soft magnetic ferrite ceramics are desired in miniaturized and efficient power electronics but remain extremely challenging to deploy on account of the power loss (P-cv) at megahertz frequencies. Here, we prepared NiCuZn ferrite with superior high-frequency properties by V2O5 and Bi2O3 synergistic doping, which proves to be a potent pathway to reduce P-cv of the ferrite at megahertz frequencies. The sample doped with 800 ppm V2O5 and 800 ppm Bi2O3 yielded the most optimized magnetic properties with a P-cv of 113 kW/m(3) (10 MHz, 5 mT, 25 degrees C), an initial permeability (mu(i)) of 89, and a saturation induction (B-s) of 340 mT, which is at the forefront of the reported results. These outstanding properties are closely related to the notable grain boundary structure, which features a new type of nano-Bi2Fe4O9 phase around ferrite grains and a Ca/Si/V/O amorphous layer. Our results indicate great strides in correlating the grain boundary structure with multiple-ion doping and set the scene for the developing high-frequency soft magnet ferrites.

Automated summary

NiCuZn ferrite with superior high-frequency properties was prepared by synergistic doping of V2O5 and Bi2O3, which effectively reduced the power loss at megahertz frequencies. The optimized sample exhibited excellent magnetic properties closely related to the notable grain boundary structure.