Diffusion of Fe in Au under elevated H2 pressure

Yoshihiro Yamazaki, Yoshiaki Iijima, Masuo Okada

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Abstract

The diffusion coefficient DFe* of Fe in Au under a H 2 pressure of 5GPa has been determined in the temperature range from 1004 to 1301K by relating the interdiffusion coefficients in single-phase Au-(Au-Fe) couples with the Darken-Manning relation. The value of D Fe*, in Au at 130IK under a H22 pressure of 5 GPa is three times that under a pressure of 5 GPa without H2, whereas the former is one tenth of that under a He pressure of 0.1 MPa. The temperature dependence of DFe* in Au under a H2 pressure of 5 GPa can be expressed as DFe* = 7.8-5.6 +20 × 10-6 exp(-195 ± 12 kJ mol -1/RT) m2 s-1. The pre-exponential factor is nearly equal to that in He at 0.1 MPa, although the activation energy is only 21 kJ mol-1 larger than that observed in He at 0.1 MPa. This behaviour contrasts with that in γ-Fe, which has a very high solubility of H2 under high pressures.

Original languageEnglish
Pages (from-to)165-174
Number of pages10
JournalPhilosophical Magazine Letters
Volume84
Issue number3
DOIs
Publication statusPublished - Mar 1 2004
Externally publishedYes

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solubility
diffusion coefficient
activation energy
temperature dependence
coefficients
temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Diffusion of Fe in Au under elevated H2 pressure. / Yamazaki, Yoshihiro; Iijima, Yoshiaki; Okada, Masuo.

In: Philosophical Magazine Letters, Vol. 84, No. 3, 01.03.2004, p. 165-174.

Research output: Contribution to journalArticle

Yamazaki, Yoshihiro ; Iijima, Yoshiaki ; Okada, Masuo. / Diffusion of Fe in Au under elevated H2 pressure. In: Philosophical Magazine Letters. 2004 ; Vol. 84, No. 3. pp. 165-174.
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N2 - The diffusion coefficient DFe* of Fe in Au under a H 2 pressure of 5GPa has been determined in the temperature range from 1004 to 1301K by relating the interdiffusion coefficients in single-phase Au-(Au-Fe) couples with the Darken-Manning relation. The value of D Fe*, in Au at 130IK under a H22 pressure of 5 GPa is three times that under a pressure of 5 GPa without H2, whereas the former is one tenth of that under a He pressure of 0.1 MPa. The temperature dependence of DFe* in Au under a H2 pressure of 5 GPa can be expressed as DFe* = 7.8-5.6 +20 × 10-6 exp(-195 ± 12 kJ mol -1/RT) m2 s-1. The pre-exponential factor is nearly equal to that in He at 0.1 MPa, although the activation energy is only 21 kJ mol-1 larger than that observed in He at 0.1 MPa. This behaviour contrasts with that in γ-Fe, which has a very high solubility of H2 under high pressures.

AB - The diffusion coefficient DFe* of Fe in Au under a H 2 pressure of 5GPa has been determined in the temperature range from 1004 to 1301K by relating the interdiffusion coefficients in single-phase Au-(Au-Fe) couples with the Darken-Manning relation. The value of D Fe*, in Au at 130IK under a H22 pressure of 5 GPa is three times that under a pressure of 5 GPa without H2, whereas the former is one tenth of that under a He pressure of 0.1 MPa. The temperature dependence of DFe* in Au under a H2 pressure of 5 GPa can be expressed as DFe* = 7.8-5.6 +20 × 10-6 exp(-195 ± 12 kJ mol -1/RT) m2 s-1. The pre-exponential factor is nearly equal to that in He at 0.1 MPa, although the activation energy is only 21 kJ mol-1 larger than that observed in He at 0.1 MPa. This behaviour contrasts with that in γ-Fe, which has a very high solubility of H2 under high pressures.

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