Enhanced magnetic properties of low-temperature sintered LiZnTiMn ferrites with Bi2O3–NiO additive

Abstract

Bi2O3 significantly influences the grain growth of LiZn ferrite ceramics, whereas NiO enhances the performance of LiZn ferrites. Herein, we present the influence of Bi2O3–NiO addition on solid-state synthesis, microstructure, density and ferromagnetic performance of LiZnTiMn ferrites at low temperatures (< 960 °C). The results reveal that an optimal amount of Bi2O3–NiO endows excellent properties to LiZnTiMn ferrites after sintering at 950 °C. X-ray diffraction and scanning electron microscopy demonstrate superior densification and grain growth due to the incorporation of Bi2O3–NiO. Moreover, the corresponding ferromagnetic properties, such as saturation induction (Bs), remanence square ratio, coercivity (Hc), ferromagnetic resonance line width (ΔH) and Ms, are also investigated to demonstrate variation. At being sintered at 950 °C with Bi2O3–NiO content of 0.25 wt%, the name rendered a Bs value of 334 mT, Br/Bs ratio of 0.877, Hc of 130 Oe and ΔH of 177 Oe. These results confirm that the presence of Bi2O3–NiO lowers the firing temperature of LiZnTiMn ferrites and endows superior magnetic properties.