Zn-Ti co-substituted LiZn microwave ferrites: Sintering characteristics and gyromagnetic properties

Abstract

To meet the low-loss and high-frequency application requirements of modern electronic information systems for integrated microwave devices, Zn-Ti co-substituted LiZn microwave ferrites were prepared in this work. The results demonstrated that Zn-Ti co-substitution promoted the grain growth and densification process during sintering, leading to a decrease in the pore-induced linewidth (ΔHp) of LiZn composite microwave ferrites; the introduction of non-magnetic Zn2+ and Ti4+ ions lowered the content of Fe3+ ions in the ferrites, which reduced the magnetocrystalline anisotropy constant |K1| and thus diminished the anisotropy-induced linewidth (ΔHa). Besides, the dielectric loss of the material decreased with increasing Zn-Ti substitution amounts (x) due to the reduction of Fe2+ ion content. As a result, when x = 0.35, the FMR linewidth was decreased from ∼251 Oe to ∼97 Oe, and the dielectric loss was greatly reduced from >100×10−4 to ∼3.82×10−4 in the ferrites. The material also exhibited excellent properties including high saturation magnetization (∼3913 Gauss), high Curie temperature (∼304 °C), and low coercivity (∼2.05 Oe).