Study of Metallic Carbides by Electron Diffraction : Part I. Formation and Decomposition of Nickel Carbide

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概要

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• Thin nickel films formed by evaporation were carburized in CO gas stream at temperatures from 250℃ to 500℃ and were studied by electron diffraction. Only Ni_3C was found to be formed. This has c.p.h. arrangement of nickel atoms with lattice constants αh = 2.628Å and ch = 4.306Å, but showed super-lattice reflections due to a hexagonal lattice of α = √<3>α_h and c = 3c_h, which is considered to be caused by a regular arrangement of carbon atoms. The carbide was formed below 450℃ in CO gas with slow rate and decomposed rapidly above 430℃ in vacuum. The rate of the carbide formation was highest at about 350℃, although it depended very much on the texture of nickel films. Hydrogen atmosphere did not alter essentially the stability of the carbide. It was found that nickel carbide is formed from metallic nickel with an epitaxial relation (00.1)_<Ni_3c>//(111)_<Ni> and [l0.0]_<ni_3c>//[101^^-]_<Ni> (Ni_3C: c.p.h. indices) at the nucleation stage. A mechanism of the lattice transformation from metallic nickel to the carbide was suggested. This mechanism explains the epitaxy and its destruction in the growth stage of the carbide crystal.

• 社団法人日本物理学会の論文
• 1957-05-05

著者

• NAGAKURA Sigemaro

  Tokyo Institute of Technology

関連論文

• Study of Martensitic Transformation in Evaporated Iron-Nickel Alloy Films by Electron Microscopy and Diffraction
• Structures of the Metal Films Produced by Vacuum-Arc Evaporation Method
• Structure of Ferrite Films Deposited by Vacuum-Arc Discharge
• Study of Metallic Carbides by Electron Diffraction : Part I. Formation and Decomposition of Nickel Carbide
• Study of Metallic Carbides by Electron Diffraction : Part II. Crystal Structure Analysis of Nickel Carbide
• Study of Metallic Carbides by Electron Diffraction : Part III. Iron Carbides
• Study of Metallic Carbides by Electron Diffraction : Part IV. Cobalt Carbides

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