Formation of ultra-fine amorphous alloy particles by reduction in aqueous solution

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219

作者：

J Van Wonterghem，S M?Rup，CJW Koch，SW Charles，S Wells

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摘要：

Amorphous alloys are normally prepared as thin ribbons or films by the liquid quench technique or by vapour deposition. Recently we have shown 1 that ultra-fine amorphous Fe–C alloy particles can be prepared by thermal decomposition of Fe(CO) 5 in an organic liquid; that is, by a chemical reaction. Here we report the preparation of small alloy particles by reduction of metal ions by KBH 4 in aqueous solutions. Mssbauer and X-ray diffraction studies show that the particles are amorphous. The amorphous phase is formed because the chemical reaction takes place below the glass transition temperature and because boron atoms are present in the particles. The method may be used for the large-scale production of ultra-fine amorphous alloy particles, which may have applications in ferrofluids, magnetic memory systems and catalysis.

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关键词：

Experimental/ alloys amorphous state materials preparation particle size reduction (chemical) solutions/ ultra-fine amorphous alloy particles reduction metal ions aqueous solutions X-ray diffraction studies amorphous phase ferrofluids magnetic memory systems catalysis/ A8120G Preparation of metals and alloys (compacts, pseudoalloys) A8230 Specific chemical reactions reaction mechanisms