高能球磨FeCo+MnO的结构与磁性研究

Structure and magnetic properties of high energy ball-milled FeCo+MnO

用高能球磨采用两种方案制备了FeCo+ MnO体系,并用X射线衍射和振动样品磁强计对其结构和磁性质做了分析。发现采用直接氧化Mn而得到MnO的方法,所得体系的MnO较纯;而通过分解MnCO_3得到MnO的体系,MnO纯度较低,有较多Mn_3O_4杂质,两种方法制备的FeCo+MnO体系的矫顽力和剩磁比都比单纯FeCo体系的增加很多,且前一种方法比后一种方法制备的FeCc+MnO体系的矫顽力和剩磁比较大。然后研究了球磨时间及退火处理对FeCo+MnO体系矫顽力及剩磁比的影响,发现球磨时间为120h体系的矫顽力和剩磁比最大;经过退火处理后,体系的矫顽力和剩磁比都有较大幅度的增加。

Two types of FeCo＋ MnO systems were prepared by means of high energy ball-milled, and analyzed by X-ray and vibrating sample magnetometer. It is found that, in the first type system in which MnO was obtained by oxidize Mn, both the purity of MnO and coercivity at room temperature is high; while in the second type system in which MnO was obtained by decomposing MnCO3, there is a little Mn3O4 as impurity. The coercivity and squareness in both types of FeCo＋MnO systems are enhanced much as compared with that of single FeCo systems. Moreover, the magnetic properties in the first systems are better than that of the second systems. The effect of milling time and annealing procedure on magnetic properties were also studied. The coercivity and squareness have the largest value as the milling time is 120h and increase much after anneal treatment.