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

[Bi0.75Y1.05−xCa1.2+x](Fe4.4−xSnxV0.6)O12 (Snx:Bi-CVG) ferrite materials were prepared by conventional ceramic technique. The bulk density, microstructure and the magnetic properties of the obtained samples were analyzed. The results showed that moderate addition of Sn4+ in Bi-CVG could lower the sintering temperature and enhance the soft magnetic properties obviously. With the increase of Sn4+ content, the saturation magnetization first increased and then decreased, while the coercivity and the ferromagnetic resonance linewidth (ΔH) first sharply decreased and then slightly increased. Additionally, the specimen of [Bi0.75Y0.65Ca1.6](Fe4.0Sn0.4V0.6)O12 sintered at 1075 °C possessed the highest density and the optimum magnetic properties: RD (the relative density) = 98.49%, Hc = 152.3 A/m, 4πMs = 711.3 × 10−4 T, ΔH = 2.1 kA/m.

Research highlights▶ The moderate addition of Sn4+ could lower the sintering temperatures and reach low temperature (1075 °C) co-fired with Ag–Pd alloy electrode. ▶ Compared to the reported achievements, the material has better magnetic properties at 1075 °C under similar preparation methods. ▶ Sn-substituted Bi-CVG ferrites reduce raw material costs of YIG.