Sb-Fe合金的电沉积及其结构与磁性能

Electro-deposition of the Sb-Fe Alloy and Its Structure and Magnetic Performance

以柠檬酸为络合剂、硼酸为缓冲剂的酸性镀液中电沉积Sb-Fe合金,循环伏安实验显示在镀液pH值为3.2时合金的起始共沉积电位约-0.855V(vs·SCE)。借助扫描电镜(SEM)、能谱分析(EDS)、X射线衍射(XRD)和振动样品磁强计(VSM)研究了沉积条件对Sb-Fe镀层结构和磁性能的影响。结果表明,在镀液pH值为3.2时,随着阴极电流密度从20mA·cm-2增加到40mA·cm-2,镀层中铁含量从2at%增加到24at%;当阴极电流密度大于40mA·cm-2,镀层中铁含量又下降。Sb-Fe镀层含有Sb-Fe固溶体(R-3m)相以及少量的铁(Im3m)相。随着Sb-Fe镀层中铁含量的增加,镀膜的矫顽力减少而饱和磁化强度则增加。镀膜的矫顽力在1.2～1.7kA·m-1范围,属软磁材料。

The Sb-Fe alloys were electro-plated from the acid plating solution containing sodium citrate as complexing agent and boric acid as a buffer agent. The cyclic voltammetrie experiments showed that the initiative co-deposition potential of the alloy at. the bath pH 3.2 is about --0. 855 V （vs. SCE）. The effect of the plating conditions on the structure and the magnetic performances of the Sb-Fe coating was studied by scanning electron microscope （SEM）, energy dispersive X-ray spectrum （EDS）, X-ray diffractometry （XRD） and vibrating sample magnetometer （VSM）, respectively. As a result, with the increase of the cathodic current density from 20 to 40 mA · cm^-2 at the plating bath pH 3. 2, the iron content of the deposit increases from 2 at% to 24 at%. But, as the cathodic current density above 40 mA · cm^-2 , the iron content of the deposit reduces. The Sb-Fe coating is composed of Sb-Fe（R-3m） solid solution and some Fe （Im3m） phases. With the increase of the iron content of the coating, the film coercivity reduces, while the saturation magnetization increases. The value of the film coercivity ranges from 1.0 to 1.7 kA · m^-1. The Sb-Fe alloy film belongs to soft magnetic material.