Abstract: The lithium-zinc ferrite doped with Bi₂O₃ was prepared by the conventional oxide ceramic process. The effect of Bi₂O₃ on properties of lithium-zinc ferrite was investigated by means of characterizing the phase component and fracture surface micrograph by X-ray diffraction (XRD) and scanning electron microscope (SEM), density by Archimedean method, and magnetic properties by B-H analyzer. The results show that Bi₂O₃ can effectively bate the volatilization of lithium, promote solid state reaction and decrease the sintering temperature, but excessive Bi₂O₃ can restrain the crystal grain growth during sintering process. An optimal amount of Bi₂O₃ is beneficial to increase the saturation magnetic induction Bs and squareness Br/Bs, and decrease the coercive force Hc of lithium-zinc ferrite.

Key words: lithium-zinc ferrite, Bi₂O₃-dope, crystal grain growth, lithium-volatilization