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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。
RE (Dy, Nd, Eu) - Fe (TM) (Co) alloy films were prepared on Cu substrate by potentiostatic electrolysis in a 353 K urea-acetamide-NaBr-KBr melt. The electrochemical behavior of the melt was investigated by cyclic voltammetry. The results of electrochemical experiments show that Co (Ⅱ) + 2e → Co (0) is a complete irreversible reaction on the Pt electrode and the transfer coefficient a and the diffusion coefficient D0 of Co (Ⅱ) on the Pt electrode are measured. The rare earth elements (Dy, Nd, Eu) are hard to be deposited alone but can be co-deposited by Co (Ⅱ). The composition and the content of the alloy film were analyzed by EDS. The XRD and vibrating sample magnetometer (VSM) were used to analyze the changes of crystalline phase and magnetic properties before and after annealing. The experimental results show that the surface morphology and magnetic properties of the alloy film are closely related to the composition and deposition potential of the alloy film, and the ability to induce rare earth ions depends on the electronegativity difference between the rare earth and iron group atoms.