Effect of Bi_2O_3 on Properties of Lithium-Zinc Ferrite

The lithium-zinc ferrite doped with Bi_2O_3 was prepared by the conventional oxide ceramic process.The effect of Bi_2O_3 on properties of lithium-zinc ferrite was investigated by means of charac- terizing 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 an- alyzer.The results show that Bi_2O_3 can effectively bate the volatilization of lithium,promote solid state reaction and decrease the sintering temperature,but excessive Bi_2O_3 can restrain the crystal grain growth during sintering process.An optimal amount of Bi_2O_3 is beneficial to increase the saturation magnetic induction B_s and squareness B_r/B_s,and decrease the coercive force H_c of lithium-zinc ferrite.