Microstructure and gyromagnetic properties of low-temperature sintered LiZnTi ferrites with Nb2O5-Bi2O3 composite additives

This study demonstrated that magnetic properties of the LiZnTi ferrite can be enhanced by precisely controlling the dosage of Nb 2 O 5 and Bi 2 O 3 additives. XRD results indicated that the ferrite possessed a spinel structure. Furthermore, SEM revealed that the synergistic effect of Nb 2 O 5 and Bi 2 O 3 not only effectively suppressed the growth of big grains but also promoted the densification of the LiZnTi ferrite. Moreover, the magnetic performance was further enhanced when doped with 0.40 wt.% Nb 2 O 5 and 1.50 wt.% Bi 2 O 3 . Specifically, the ferromagnetic resonance linewidth ( ΔH ) decreased to 220 Oe and the saturation magnetization (4π M s ) of LiZnTi ferrite increased to 2619 Gs. The improvements of magnetic performance indicated that Nb 2 O 5 and Bi 2 O 3 are promising composite additives for the preparation of low-loss ferrite materials for microwave devices.