Abstract
Bi2O3 and Al2O3 were proven to separately have an impact on grain growth of LiZn ferrite ceramics. In this study, we synthesized LiZnTiMn ferrite ceramics under low temperature (<920 °C) using rationally designed formula of Bi2O3-Al2O3 as sintering agents. Microstructures, densities, and ferromagnetic performances were systematically investigated. Results show that appropriate amount of Bi2O3-Al2O3 leads to successful sintering of LiZnTiMn ferrites even below 900 °C. X-Ray diffraction (XRD) and scanning electron microscopy (SEM) results show that spinel structure ferrite ceramics were obtained and that the addition of Bi2O3-Al2O3 accelerated solid-state reaction. Corresponding ferromagnetic properties, including saturation induction (Bs), remanence square ratio, coercivity (Hc), ferromagnetic resonance linewidth (ΔH), and Ms, were also investigated. At 920 °C, with addition amount of x=1 wt%, we obtain excellent performance: Bs=306 mT, Br/Bs=0.849, Hc=2.34Oe, and ΔH=275 Oe. Results indicate that Bi2O3-Al2O3 is promising sintering agent for low-temperature sintering of LiZnTiMn ferrite ceramics.
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