【摘要】 在353K的乙酰胺-尿素-NaBr-KBr熔体中,用恒电位电解法在Cu基片上制备了Sm-Fe合金膜。利用循环伏安法研究其不同熔体组分下的电化学行为。在Pt电极上,Fe2++2e→Fe是一步完全不可逆反应;可测得在FeCl2-乙酰胺-尿素-NaBr-KBr熔体中的Fe2+传递系数α=0.39,扩散系数D0=7.55×10-5cm2·s-1。Sm3+难以单独沉积,但可以被Fe2+诱导共沉积,在不同阴极电位下制备出含Sm量各异的合金膜。通过等离子发射光谱仪(ICP)检测合金膜成分,用XRD分析了制备态合金膜的晶相结构,用扫描电镜(SEM)观测合金膜的表面形貌,用振动样品磁强计(VSM)测量了合金膜的磁性能。结果表明,制备态Sm-Fe合金膜为非晶结构,在773K退火30s后则变为多晶结构;合金膜中Sm含量随沉积电位负移而增加;退火和Sm含量对Sm-Fe合金膜的磁性能有重要影响。更多还原

【Abstract】 Sm-Fe alloy films electrodeposited on copper substrates in urea-acetamide-NaBr-KBr melt at 353 K, were prepared. The cyclic voltammetry was used to study the electrochemical behavior. On the Pt electrode, reduction of Fe2+ to metallic Fe is irreversible in one step, and the electron transfer coefficient α and diffusion coefficient D0 of Fe2+ in (0.040 mol·L-1)FeCl2-urea-acetamide-NaBr-KBr were determined as follows: α=0.39 and D0=7.55×10-5cm2·s-1, respectively. Sm3+ is not reduced to Sm alone,but it can be inductively co-deposited with Fe2+. The content of Sm was analyzed by ICP, 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 prepared samples are amorphous, while those samples annealed at 773 K for 30 s are polycrystalline; the content of Sm in the Sm-Fe alloy films increases with the decrease of the cathode potential; the samarium content and heat-treatment have important influence on magnetic properties of SmxFe17 alloy films.更多还原