Fe-Co複合シュウ酸塩の還元による金属微粒子の生成

概要

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Various compositions of Fe-Co double oxalates were prepared by adding mixed solution of Fe and Co chlorides to oxalic acid solution. The structure and interplanar distance of the resulting precipitates were determined by X-ray powder diffraction. The linear change of the interplanar distances with composition is convincing that the coprecipitated Fe-Co double oxalates are solid solutions.<BR>The thermal analysis of the hydrogen reduction process of Fe-Co double oxalates was carried out using differential thermal analysis and thermogravimetric analysis, and these data revealed that the oxalates were reduced to metallic state at relatively low temperature.<BR>The results of X-ray powder diffraction and electron microscopic observation show that the fine particles thus obtained are alloy particles with crystal structure and lattice spacings identical with those of corresponding bulk specimens at reduced temperature. The particles are in the typical skeleton form consisting of much smaller unit particles. The size of skeleton form particle is deter- mined by the size of the oxalate particle. On the other hand the size of the unit particles can be changed by reduced temperature and time. It is possible to obtain the skeleton particles with the unit particle siz less than 300 angstroms.
社団法人日本材料学会の論文