Enhanced properties of Li_0.42Zn_0.27Ti_0.11Mn_0.1Fe2.1O₄ ferrites co-fired with Bi₂O₃-B₂O₃ additive at low sintering temperatures

n this study, Li0.42Zn0.27Ti0.11Mn0.1Fe2.1O4 ferrites were co-fired with Bi2O3-B2O3 (BB) additive at low sintering temperatures (similar to 920 degrees C), and the effects of BB additive on various properties of Li-Zn ferrites were systematically investigated. First of all, the existence of BB additive would not pollute the spinel phases of Li-Zn ferrites, in contrast, it could make the ferrites well-ripened at low temperatures. The micro-morphology results revealed that the introduction of BB additive could significantly promote the grain growth, where the average diameter of grain size increased from 0.81 mu m (0.0 wt % BB) to 8.12 mu m (0.5 wt % BB), leading to a higher densification degree and density. Owing to the liquid phase formed in the sintering process, magnetic properties of the Li-Zn ferrites were improved with the assistance of BB additive. The saturation flux density (B-s) and saturation magnetization could reach a maximum value of 319.3 mT and 74.2 emu/g, respectively. The coercivity (H-c) and ferromagnetic resonance (FMR) linewidths (Delta H) could reach a minimum value of 176.3 A/m and 243.2 Oe, respectively. Finally, it is noted that the optimal values of these parameters are obtained under the condition of 0.5 wt % BB additive doped, and most magnetic properties would be deteriorated when exceeding the above content. Thus, BB additive is considered as a promising sintering aid for synthesizing Li-Zn ferrites at low temperatures, which will play a vital role in the development of low-temperature co-fired ceramics (LTCC) technology.