Electrodeposition of Aluminum from the Aluminum Chloride‐1‐Methyl‐3‐ethylimidazolium Chloride Room Temperature Molten Salt + Benzene
Electrodeposition of Aluminum from the Aluminum Chloride‐1‐Methyl‐3‐ethylimidazolium Chloride Room Temperature Molten Salt + Benzene
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DOI：
10.1149/1.1837510
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发表时间：
1997-03
影响因子：
3.9
通讯作者：
Qing Liao;W. Pitner;Gemma Stewart;C. Hussey;G. Stafford
中科院分区：
文献类型：
--
作者：
Qing Liao;W. Pitner;Gemma Stewart;C. Hussey;G. Stafford
研究了在刘易斯酸性[> 50 mol %（m/o）AlCl 3 ]氯化铝-1-甲基-3-乙基咪唑氯化物室温熔盐（AlCl 3 -MeEtimeCl）中铜基上恒电流电沉积块状铝的工艺。虽然铝可以从纯熔盐电镀，我们已经发现，电沉积的质量大大提高了苯作为助溶剂的添加。在这种熔体中产生的电沉积物显示出5至15 μm的晶粒尺寸。这些电沉积物的晶格参数略小于粉末衍射标准联合委员会（JCPDS）的值;这是由于铝晶格中存在的空位，其浓度范围为约0.1至0.5原子百分比（a/o）。通过X射线衍射测定，发现铜基底具有轻微的（311）织构;然而，所有电沉积物都表现出优选的（220）晶体取向，其中（311）反射的强度等于随机取向样品的强度。（200）和（111）反射相对较弱。随着苯浓度的增加，（220）面反射的相对强度增加，（311）、（200）和（111）面反射的相对强度降低。Williamson-Hall处理表明电沉积物中的微应变基本上不存在。
The constant current electrodeposition of bulk aluminum on copper substrates was investigated in the Lewis acidic [> 50 mole percent (m/o) AlCl 3 ] aluminum chloride-1-methyl-3-ethylimidazolium chloride room temperature molten salt (AlCl 3 -MeEtimeCl). Although aluminum can be electroplated from the neat molten salt, we have found that the quality of the electrodeposit is greatly enhanced by the addition of benzene as a cosolvent. Electrodeposits produced in such melts exhibited a grain size on the order of 5 to 15 μm. The lattice parameters of these electrodeposits were slightly smaller than the Joint Committee on Powder Diffraction Standards (JCPDS) value; this was attributed to the presence of vacancies in the aluminum lattice that were present at concentrations ranging from about 0.1 to 0.5 atomic percent (a/o). The copper substrate was found to have a slight (311) texture as determined by x-ray diffraction; however, all of the electrodeposits exhibited a preferred (220) crystallographic orientation with the intensity of the (311) reflection being equal to that of a randomly oriented sample. The (200) and (111) reflections were relatively weak. The relative intensity of the (220) reflection increased and those for the (311), (200), and (111) orientations decreased as the benzene concentration was increased. A Williamson-Hall treatment indicated that microstrain in the electrodeposits was essentially nonexistent.