Cr-N系のMA過程における原子構造変化

概要

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Cr-N amorphous powders have been produced through the solid-gas reaction subjected to mechanical alloying(MA) of pure Cr powders under N<SUB>2</SUB> gas atomsphere and through the solid state reaction subjected to the MA of a mixture of Cr, Cr<SUB>2</SUB>N and CrN powders under Ar gas atomsphere. The atomic structure during amorphization process was observed by X-ray and neutron diffraction. An advantage of the neutron diffraction technique allows us to observe the local structure surrounding a N atom because of a large coherent scattering length of the N atom in comparison with that of the Cr atom. The coordination number of metal atoms around a N atom approaches with 5-5.5 atoms. This implies that the nitrogen atom is located at both of centers of the tetrahedron, octahedron and/or trigonal prism formed by metal atoms to stabilize the amorphous structure.
社団法人粉体粉末冶金協会の論文