The Research On Synthesis Of Mn-Zn Ferrite Particles Via Ultrasonic Wave-assisted Aqueous Ball Milling Technology

Mn1-xZnxFe2O4(x=0.2,0.5,0.8) were directly synthesized at low temperature(≤100℃) by ultrasonic assisted solid-liquid reaction ball milling technique and werecharacterized by XRD, TEM and VSM. The Mn1-xZnxFe2O4powders possessed a highsaturation magnetization which reached69.20emu/g, and the mean size of particleswas about20nm. This paper studied the influence of the different x value ofMn1-xZnxFe2O4to the magnetic property of production, in which the saturationmagnetization of Mn0.5Zn0.5Fe2O4was highest. The experiment results showed that theultrasonic wave-assisted aqueous solution ball milling without subsequent calcinationscan directly synthesize Manganese-zinc ferrite nanoparticles which have the latticeperfection and excellent magnetic properties. In order to investigate the coupling effectof ultrasonic wave and mechanical force, three contrast experiments were carried outincluding the aqueous solution ball milling with and without ultrasonic wave andultrasonic wave without ball milling. In addition, in the procession of experiment, therelative content of aqueous solution OH radicals were tested in different time, theresults indicated the coupling effect of ultrasonic wave and mechanical forcesignificantly accelerated the reaction process. Finally, the electrochemistry methodwas also used to test that the relative content of conductance in different time. Theresults indicated that the solution reaction activity was the highest in ultrasonicwave-assisted aqueous solution ball milling process. The results were listed asfollows:：(1)Mn1-xZnxFe2O4(x=0.2，0.5，0.8) were directly synthesized at low temperature(≤100℃) by ultrasonic assisted solid-liquid reaction ball milling technique.TheMn1-xZnxFe2O4powders possessed a high saturation magnetization which reached69.20emu/g, and the mean size of particles was about20nm. Only by ball milling oronly by ultrasonic wave radiation was unable to generate Mn1-xZnxFe2O4.(2)At the beginning of the aqueous solution ball milling with ultrasonic wavereaction, the OH free radical was higher than only by ball milling or only by ultrasonicwave radiation. The increase of the OH free radical can improve the reaction reactivityto prompt the synthesis of Mn1-xZnxFe2O4. But in the process of only by ball milling oronly by ultrasonic wave radiation, because there was no chemical reaction to consumethe OH free radical, the fluorescence intensity up to a certain value tended to be gentle.The solution reaction activity was the highest in ultrasonic wave-assisted aqueous solution ball milling process.(3)The different synthesis methods and the different composition ofMn1-xZnxFe2O4have a significant impact on the magnetic properties. For a relativelylow x value, when x increased from0.2to0.5, the magnetic property of theMn1-xZnxFe2O4increased. When x increased from0.5to0.8, the magnetic property ofthe Mn1-xZnxFe2O4will decrease. By the ultrasonic assisted solid-liquid reaction ballmilling technique, the saturation magnetization was the highest when x=0.5.