水熱条件下での単体からの鉄族金属硫化物の合成(<特集>水溶液科学に立脚したセラミックス合成プロセス)

概要

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Iron group metal sulfides were synthesized from the elements under hydrothermal condition. For nickel sulfides, two kinds of nickel metal powder, coarse powder passed through 63μm mesh and fine powder passed through 3μm mesh, were used as the starting materials. The reaction with the coarse Ni powder gave NiS with appreciable amount of Ni, Ni_3S_2, and Ni_9S_8. Pure NiS was obtained by the reaction with the fine Ni powder at 240℃ for 10h. The lowest nickel sulfide Ni_3S_2 was obtained as a single phase product of the reaction if the coarse Ni powder was used. From these results, the fine and coarse powders were found to be suitable for the syntheses of NiS and Ni_3S_2, respectively. The lowest cobalt sulfide Co_9S_8 was obtained almost as a single phase though the XRD pattern of the product showed some unidentified peaks. Pure Co_9S_8 was obtained by washing the reaction product with HNO_3. In the Fe-S system, FeS was obtained with a small amount of Fe_3O_4.
社団法人日本セラミックス協会の論文
2007-12-01