Diffusion of Hydrogen and Deuterium in High Purity Iron between 222 and 322 K

• Nagano M.

  Graduate School, Kyushu University

• Hayashi Y.

  Department of Iron and Steel Metallurgy, Faculty of Engineering, Kyushu University

• Ohtani N.

  Department of Iron and Steel Metallurgy, Faculty of Engineering, Kyushu University

• Isshiki M.

  Department of Materials Science, Faculty of Engineering, Tohoku University

• Igaki K.

  Department of Materials Science, Faculty of Engineering, Tohoku University

抄録

Diffusion coefficients of hydrogen and deuterium in high purity iron were measured by an electrochemical alternating current method at temperatures between 222 and 322 K . In this method, the diffusion coefficient can be evaluated from the frequency response of the phase difference between an anodic permeation current and a cathodic charging current by eliminating the surface effect from the permeation process. The diffusion coefficient of hydrogen in iron is proposed to be D^H(m²⁄s)=4.90×10⁻⁸exp(−4200(J⁄mol)⁄RT). The activation energies of diffusion for the two hydrogen isotopes were equal at 4200 J/mol. And the isotope ratio of pre-exponential factors, D₀^H⁄D₀^D, was determined to be 1.24, which was a little smaller than the classical ratio 1.41. At low temperatures, the trapping effect by lattice imperfections was observed, and it was more remarkable for deuterium than for hydrogen.

収録刊行物

• Transactions of the Japan Institute of Metals

  Transactions of the Japan Institute of Metals 22 (6), 423-429, 1981

  社団法人 日本金属学会

キーワード

• General Engineering

詳細情報

• CRID: 1390001205117730944
• NII論文ID: 130003485915
• DOI: 10.2320/matertrans1960.22.423
• ISSN: 24324701
• ISSN: 00214434
• Web Site: https://www.jstage.jst.go.jp/article/matertrans1960/22/6/22_6_423/_pdf
• 本文言語コード: en
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