Structure des Nitrures de Niobium

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概要

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• The crystal structure studies of niobium nitrides by electron and X-ray diffraction technique led to the identification of four phases: NbN (cubic,δ-phase), Nb_2N (hexagonal,β-phase), NbN (hexagonal, ε-phase) and Nb_4N_3 (tetragonal, γ-phase). Various methods were used to prepare thin films of Nb nitrides for electron diffraction studies. Firstly, three kinds of oxynitrides, Nb(N,O)I, Nb(N,O)II and Nb(N,O)III were obtained by nitriding the evaporated thin films of Nb in an atmosphere of ammonia. NbN (cub) was formed on heating in vacuo of thin films of Nb(N,O)I, and it was further decomposed into Nb_2N (hex) at a higher temperature. Covering with Nb fine powders makes possible the nitriding of thin films of Nb into NbN (hex). Successive structure transformations NbN (hex) ⇾ NbN (cub) ⇾ Nb_4N_3 (tet) ⇾ Nb_2N (hex) were observed by heating in vacuo. Electron diffraction diagrams show the superlattice structures of Nb_2N (hex) and Nb_4N_3 (tet). The crystal structure of Nb_2N (hex) is the same type as that of Nb_2C. The structure of Nb_4N_3 (tet), however, is derived from the cubic NaCl type structure of NbN (cub) by the loss of one quarter of nitrogen atoms.

• 社団法人応用物理学会の論文
• 1965-05-15

著者

• Terao Nobuzo

  Union Carbide European Research Associates

関連論文

• Structure Cristalline du Dioxyde de Niobium
• Structures des Oxydes de Niobium
• Structure des Carbures de Niobium
• Structure des Oxydes de Niobium Transformation de Structure du Nb_2O_ en Nb_2O_ et la Formation du NbO_2
• Some Observations on Nickel Oxide Scale
• Structure des Nitrures de Niobium
• Reactions of New Thermite Systems
• Structure Transformation in Co(60)Ni(20)Cr(20) Alloy by Mechanical Deformation

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