Electrochemical Preparation of La—Fe Alloy Films in Dimethylsulfoxide(DMSO) |
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引用本文: | 袁定胜,刘冠昆,童叶翔.Electrochemical Preparation of La—Fe Alloy Films in Dimethylsulfoxide(DMSO)[J].中国稀土学报(英文版),2002,20(3):182-187. |
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作者姓名: | 袁定胜 刘冠昆 童叶翔 |
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作者单位: | School of Chemistry and Chemical Engineering,Zhongshan University,Guangzhou 510275,China |
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基金项目: | ProjectsupportedbytheScienceFoundationofGuangdongProvince (0 112 15 ) |
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摘 要: | Rareearthsandtheiralloyshavespecificproperties ,suchasmagnetic ,optical,electricandhydrogenstorage .Theyhavebeenwidelyappliedtovariousfunctionalmaterials .TheLa Fealloyshavebeenappliedasmagneticmaterials .Sincerareearthelementsareveryactive,itisverydifficu…
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关 键 词: | 稀土合金薄膜 稀土 镧 电沉积 DMSO |
Electrochemical Preparation of La-Fe Alloy Films in Dimethylsulfoxide (DMSO) |
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Abstract: | The cyclic voltammetry and potential step methods were used to investigate the electrochemical behavior of Fe2+ and La3+ in FeCl2-LiCl-DMSO and LaCl3-LiCl-DMSO systems on Pt, Cu and Ni cathodes. The electroreduction of Fe2+ to Fe is irreversible in one step,while the electroreduction of La3+ to La is quasi-reversible. The diffusion coefficient of La3+ in LaCl3-LiCl-DMSO system at 298 K was 3.1×10-6 cm2s-1. The diffusion coefficient and transfer coefficient of Fe2+ in FeCl2-LiCl-DMSO system at 298 K were 2.54×10-6 cm2*s-1 and 0.24, respectively. La-Fe alloy films containing La from 22.7% to 37.1% (mass fraction) were prepared by potentiostatic electrolysis on Cu substrates at a deposition potential from -1.750 to -2.450 V (vs SCE). The fine La-Fe alloy films were also obtained by pulse electrolysis at a pulse current densities from 2 to 6 mA*cm-2. The surfaces of these alloy films are smooth, adhesive and uniform, and have metallic luster. |
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Keywords: | rare earths lanthanum electrodeposition DMSO La Fe alloy films diffusion coefficient transfer coefficient |
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