Study of Metallic Carbides by Electron Diffraction : Part III. Iron Carbides

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概要

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• Thin iron films formed by evaporation were carburized in CO gas stream. The carbides ε, χ and θ were found to be formed in the temperature ranges (i) below 250℃, (ii) from 250° to 350℃ and (iii) above 350℃, respectively. The ε-carbide is hexagonal with lattice constants α = 4.767Å and c = 4.354Å, and its structure belongs to the space group P6_322, iron atoms occupying 6g positions with the parameter x = 1/3 and carbon atoms 2d positions. Irreversible phase transitions from ε to χ and from χ to θ take place at 380°〜400℃ and at about 550℃, respectively. By the transitions changes in the chemical compositions may be very small. Observation on the crystal growth suggests that a mechanism of the ε-carbide formation is different from that of the χ- and θ- carbide formations.

• 社団法人日本物理学会の論文
• 1959-02-05

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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