Uniform grains and enhanced magnetic properties of V₂O₅-doped low-temperature sintered NiCuZn ferrite thick films prepared using the tape-casting method

NiCuZn ferrites prepared by conventional solid-state reaction typically exhibit uneven grain growth and high sintering temperatures, which significantly limit their deployment in high-frequency electronics and aerospace systems. In this study, we systematically optimize the microstructure and enhance the magnetic properties of low-temperature sintered NiCuZn ferrite thick films prepared by tape-casting, using low-melting-point V₂O₅ as a dopant. The results indicate that the introduction of V₂O₅ effectively promotes grain growth, eliminates intergranular pores, and yields a dense microstructure with well-defined grain boundaries. At sintering conditions of 900 °C, the sample doped with 0.50 wt% V₂O₅ exhibits the most comprehensive magnetic performance. Compared with the undoped samples, the saturation flux density((Formula presented) ) increases by 21.2%, the coercivity ((Formula presented) ) decreases by 28.9%, and power loss ((Formula presented) ) decreases by 28.8%. The research results confirm that the combined tape-casting and V₂O₅ doping provides an effective and feasible technical route for fabricating low-temperature sintered NiCuZn ferrite thick films with uniform grains and excellent magnetic properties.