Positron annihilation in solid,liquid and undercooled melts of Co80Pd20 |
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Authors: | C Bührer U Holzwarth K Maier D Platzek J Reske |
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Institution: | (1) Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115 Bonn, Germany;(2) Institut für Raumsimulation, Deutsche Forschungsanstalt für Luft- und Raumfahrt, D-51140 Köln, Germany |
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Abstract: | Positron annihilation measurements have been performed in solid, liquid and undercooled Co80Pd20 alloy using electromagnetic levitation as containerless processing method. The formation enthalpy for a single vacancy is H1v = (1.7 ± 0.1) eV. In the melt, the thermal expansion continues linear in the undercooled phase and is larger than that of the solid alloy. The mean free volume in the liquid phase is slightly larger than the volume of a single vacancy. At the Curie temperatures of both solid and liquid phase, the S-parameter indicates no effect on the atomic structure. Different H2 concentrations in the processing gas atmosphere have no detectable influence on the data. |
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Keywords: | 78 70 Bj 61 25 61 72 75 40 |
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