电沉积RE-TM(RE=Dy,Nd,Eu;TM=Co)合金膜及其磁性质  

Electrodeposited RE-TM(RE=Dy,Nd,Eu;TM=Co) Alloy Films and Their Magnetic Properties

作　　者：范必强[1] 赖恒[1] 李加新[2] 黄志高[1] 

机构地区：[1]福建师范大学物理与光电信息科技学院,福建福州350007 [2]中国科学院福建物质结构研究所,福建福州350002

出　　处：《稀土》2011年第3期8-13,共6页Chinese Rare Earths

基　　金：国家自然科学基金(60676055);福建省教育厅基础科学基金资助项目(2008F5201)

摘　　要：在353 K的尿素-乙酰胺-NaBr-KBr熔体中,用恒电位电解法在Cu基片上制备了稀土RE(Dy,Nd,Eu)-铁族TM(Co)合金膜。利用循环伏安法研究了熔体的电化学行为。电化学实验结果表明,在Pt电极上,Co(Ⅱ)+2e→Co(0)是一步完全的不可逆反应,并测得Co(Ⅱ)在Pt电极上的传递系数a以及扩散系数D0。稀土元素(Dy,Nd,Eu)难以被单独沉积,但能被Co(Ⅱ)诱导共沉积。用EDS分析合金膜的成分及含量。用XRD和振动样品磁强计(VSM)分析样品退火前后的晶相和磁性能变化特征。实验结果表明,合金膜的表面形貌和磁性与其成分组成及沉积电位紧密相关,且稀土离子的被诱导能力取决于稀土与铁族原子之间的电负性差值。Rare earth （RE = Dy,Nd,Eu） -3d transition metal （TM = Co） alloy films were codeposited on copper substrate in urea - acetarnide - NaBr - KBr melt at 355K. The cyclic voltammetry was used to study the electrochemical behavior, showing that the electroreduction of TM was irreversible in one step. The transfer coefficient α and the diffusion coefficient DO of Co^2＋ were measured. RE^3 ＋ could not be reduced alone, but it could be inductively codeposited with Co^2＋. The composition of films was analyzed by EDS; the crystalline phases were investigated by XRD; the microstructures were observed by SEM; and the magnetic properties were measured by VSM. The experimental results reveal that, the surface morphologies and the magnetic properties of the RE - TM alloy films depend strongly on the composition and electrodeposition potential, furthermore the RE -induced codepesition ability is dominated by the electronegnfivity difference between RE and TM atoms.

关 键 词：RE(Dy Nd Eu)-TM(Co)合金膜 诱导共沉积 制备态磁性能 

分 类 号：O646.8[理学—物理化学]