Fe-Ni-Cu3元合金触媒を用いたダイヤモンドの合成

概要

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Diamond was synthesized by using the Fe-Ni-Cu alloy. As compared with the diamond-formation region obtained with the Fe-Ni alloy, the region shifted to the lower temperature and pressure side. This shift has been explained in terms of the change of melting temperature due to an addition to Fe-Ni alloy, because Cu itself has no catalytic effect on the transformation of graphite to diamond. However, the excess of Cu content in the alloy seemed to suppress the transformation. EDX analysis revealed that the chemical composition of inclusion in diamond crystals was similar to that of catalyst. Judging from the morphology of diamond, the formation was governed substantially by the dissociation-precipitation process of carbon in the melted alloy. The mechanism proposed here coincided with that of the catalytic reaction of Ni to form diamond.
社団法人日本セラミックス協会の論文
1987-12-01