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Determination of the ferromagnetic vacancy-formation enthalpy in α-iron by the positron method using the carbon-vacancy pair as a probe |
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| Authors: | L de Schepper D Segers G Knuyt L Dorikens-Vanpraet M Dorikens L Stals P Moser |
| Institution: | 1. Materials Physics Group, Limburgs Universitair Centrum, B-3610 Diepenbeek, Belgium;2. Laboratorium voor Kernfysika, Rijksuniversiteit Gent, Proeftuinstraat 42, B-9000 Gent, Belgium;3. Section de Physique du Solide, Département de Recherche Fondamentale, Centre d''Etudes Nucléaires de Grenoble, 85X, 38041 Grenoble Cedex, France |
| Abstract: | The 511 keV positron annihilation lineshape was measured as a function of temperature between 600 and 1183 K in extremely pure and carbon-doped (50 and 750 appm C) iron. Whereas in pure iron no trapping of positrons is observed below the Curie temperature (1043 K), trapping in carbon-vacancy pairs is observed in this temperature range in the carbon-doped samples. This allowed us to determine the ferromagnetic vacancy-formation enthalpy as 2.0 ± 0.2 eV. |
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