Inhibition of magnetostriction in NiCuZn ferrite via controlling Fe–O Octahedral distortion by vanadium doping

The magnetostriction effect of ferrite materials will adversely affect their application in high-precision electrical measurement scenarios. In this study, vanadium pentoxide (V 2 O 5 ) was introduced as both a sintering aid and a dopant in the solid-state sintering process of iron-deficient NiCuZn ferrites with the composition (Ni₀.₂Cu₀.₂Zn₀.₆O)₁.₀₃(Fe₂O₃)₀.₉₇. The results show that the addition of V₂O₅ effectively promots grain growth, increasing the average grain size from approximately 1 μm to 6 μm, and enhances the compactness of the material, which would compensate the magnetization reduction due to the replacement of Fe 3+ by V 5+ . When the doping concentration of V 5+ is controlled below 3 at%, the magnetostriction strain of the ferrite can by minimized to approximately 8 ppm without significant loss of key magnetic properties such as permeability and saturation magnetization. In addition, vanadium doping also improved electrical resistivity of NiCuZn ferrite, thereby reducing eddy current losses and power loss of material under high-frequency (50 kHz and 100 kHz) electromagnetic fields, which make the V 5 ⁺ doped NiCuZn ferrites possibly be used in the high-precision and high frequency measurement.