α-Fe_2O_3纳米微粒的制备及其Mssbauer谱研究

Preparation and Mssbauer Studies of α-Fe_2O_3 Nanoparticle

通过高能球磨的研磨 ,直接由普通α Fe2O3 粗颗粒制得了粒径约为10nm的α Fe2O3 纳米微粒.发现所得纳米微粒的室温M ssbauer谱为不对称向内加宽的磁分裂六线峰.分析表明 ,不对称向内加宽现象主要由集体磁激发效应所引起.球磨所得α Fe2O3 纳米晶具有很高的各向异性常数值(K=8.9×103J·m -3).

Fe2O3 nanoparticle with diameter of 10 nm was prepared by high energy ball milling directly from coarse α-Fe2O3 powders.It was found that the Mssbauer spectrum of the α-Fe2O3 nanoparticle at room temperature showed magnetic splitting sexlet lines broadened asymmetrically toward the central peaks .The asymmetric broadening of the spectral peaks could be attributed to the collective magnetic excitations.The anisotropic constant of the α-Fe2O3 nanoparticle exhibited a very high value (K=8.9×103J·m-3).