【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。更多还原

【Abstract】 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 D0 of Co2+ were measured.RE3+ could not be reduced alone,but it could be inductively codeposited with Co2+.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 codeposition ability is dominated by the electronegativity difference between RE and TM atoms.更多还原