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• W1976123000 abstract "The value of the vacancy migration enthalpy in α-iron has been the subject of a long standing controversy. In the one-interstitial model, the value of 0.55 eV has been put forward, whereas in the two-interstitial model a value of about 1.3 eV is given. In a review paperl, it was concluded that the majority of experimental data is in favour of the one-interstitial model. It was also pointed out that, if one accepts this model, an important problem remained to be solved: the vacancy migration enthalpy that can be obtained by subtracting the vacancy formation enthalpy from the self diffusion enthalpy (provided that self-diffusion is driven by a vacancy mechanism), was more than twice the vacancy migration enthalpy of the one-interstitial model.We report here on research we performed concerning this problem. The values of the enthalpies of vacancy formation and self diffusion were carefully re-investigated, taking into account: 1) the influence of ferromagnetic ordering, and 2) the influence of the strong interaction between residual carbon atoms and vacancies.To determine the ferromagnetic self diffusion enthalpy QSD,f, we used reliable literature data on self diffusion in iron. The main conclusion of our analysis is that only an upperlimit to QSD,f, can be given2: QSD,f ⩽2.75 eV.We also performed positron annihilation measurements in thermal equilibrium on pure and carbon doped (50 and 750 appm) samples to determine the ferromagnetic vacancy formation enthalpy HVf,f. In very pure iron no trapping of positrons is observed below the Curie point, so that HVf,f cannot be determined. However in carbon-doped samples the carbon-vacancy pair can be used as a probe to determine HVf,f. We obtained: HVf,f = (2.0 ± 0.2) eV. This value is the first fully experimental determination of this parameter.By combining the data given above, we conclude that an upperlimit to the ferromagnetic vacancy migration enthalpy HVm,f is: HVm,f ⩽ 0.95 eV. On the other hand, it can be shown3 that HVm,f ⩾ 0.16 eV.We therefore conclude that there is no longer an inconsistency between the one-interstitial model and the vacancy migration enthalpy derived from thermal equilibrium measurements." @default.
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• W1976123000 date "1984-05-01" @default.
• W1976123000 modified "2023-09-27" @default.
• W1976123000 title "Confirmation of the one-interstitial model for α-iron from positron annihilation experiments in thermal equilibrium on pure and carbon doped samples" @default.
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• W1976123000 doi "https://doi.org/10.1016/0022-3115(84)90207-1" @default.
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