| Ni－B超细非晶合金的化学制备、反应机理及性质研究 |
| AN INVESTIGATION OF CHEMICAL PREPARATION, REACTION MECHANISM AND THE PROPERTIES OF Ni-B ULTRAFINE AMORPHOUS ALLOY |
|
| 摘要: 本文研究了水溶液中NiCl2与KBH4的反应及其产物Ni-B超细非晶合金的性质,详细探讨了反应的电化学基础和反应过程及机理.发现Ni2+与BH4-的反应由三个独立的基本反应组成,其中不可避免地存在BH4-的分解即与H2O的反应,Ni-B则产生于Ni2+的还原(被BH4-)和BH4-离子内部的氧化还原反应.反应中,反应液的pH值可自动恒定在3.18左右.在总包反应中,完全还原1molNi2+需要消耗1.84molBH4-,其中BH4-的分解反应约占48%.根据反应机理可计算产物的组成,计算结果与实际测定值完全一致.电镜测定表明,反应产物呈非晶态,粒径约400Å. |
| 关键词: Ni－B非晶合金 超细粒子 化学反应机理 液相还原 |
| 基金项目: 国家自然科学基金;石化总公司基础研究基金 |
| Abstract: This paper reports the results of our studies on the reaction between NiCl2 and KBH4 in aqueous solution and the properties of the reaction product, Ni-B ultrafine amorphous alloy.The reaction procedure and the mechanism as well as the electrochemistry of the reaction are discussed in detail. It was found that the reaction of Ni2+ and in BH4- aqueous solution can be divided into three independent elementary reactions, one of which is the hydrolysis of BH4-. The product Ni-B alloy is produced through the reduction of Ni2+ by BH4- and the disproportionation of BH4-(the reduction of B+3 by H- in BH4-). The pH value of the reaction mixture remains at about 3.18 throughout the reaction. For the complete reduction of 1 mole of Ni2+, about 1.84 moles of BH4-are needed, in which 48% are actually hydrolyzed. The composition of the Ni-B product can be predicted according to the reaction mechanism we proposed and the results are in good agreement with the experimental values determined by ICP. Electron diffraction and transmission electron microscopy show that the Ni-B product is in the amorphous state with average particle size of about 400Å. |
| Keywords: Ni-B amorphous alloy ultrafine particles reaction mechanism liquid phase reduction |
| 投稿时间：1993-09-07 |
| 摘要点击次数: 1552 |
| 全文下载次数: 1792 |
| 沈俭一,李智渝,陈懿.Ni－B超细非晶合金的化学制备、反应机理及性质研究[J].无机化学学报,1995,11(1):1-7. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
