Effects of In-substitution on the microstructure and magnetic properties of Bi-CVG ferrite with low temperature sintering

[Y1.05Bi0.75Ca1.2](Fe4.4−xInxV0.6)O12(Inx:Bi-CVG) ferrite material has been prepared successfully by a solid-state reaction method. The effects of In3+ substitution and sintering temperatures on the bulk density, microstructure and magnetic properties are performed by X-ray diffraction (XRD), scanning electron microscopy (SEM), materials automatic test system (MATS) and microwave ferrite parameters meter. The results show that In3+ can lower the sintering temperatures and enhance the magnetic properties of Bi-CVG ferrite. Besides, all sintered specimens with different In3+ contents show a single garnet crystal structure. The specimen of [Y1.05Bi0.75Ca1.2](Fe4In0.4V0.6)O12 sintered at 1075 °C shows homogenous distribution of grain size and densified microstructures. The ferromagnetic resonance linewidth (ΔH) has an increase with In3+ contents. Additionally, the sample has the optimum magnetic properties: ρ=5.23 g/cm3, Br=31.3 mT, Hc=378.8 A/m, 4πMs=506.2×10−4 T.