M£¨?£©ssbauer Spectra for Ultrafine Particles Fe₃O₄

Haibo LI Weitao ZHENG Yudong LIU Ruilin ZHANG Department of Materials Science,Jilin University,Changchun,130023,China

Õª Òª£º<Õý> The procedure of preparing specimens of ultrafine particles £¨UFP£© Fe₃O₄ was studied and themeasurement and analysis of the Mssbauer spectra at room temperature was made.After thehyperfine field due to iron was analyzed carefully,it is shown that the interaction of the interfaces be-tween grains of UFP Fe₃O₄ has stronger effects £¨enlarging the quadrupole splitting in Mssbauerspectrum£© and it is found that superparamagnetic effects appear,which means that the magneticproperty of UFP Fe₃O₄ is different from that of bulk Fe₃O₄.

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