J. Phys. IV France 11 (2001) Pr10-103-Pr10-107
Phase transitions in AU0.5Cu0.5M. Guymont1, Y. Feutelais2 and B. Legendre2
1 Métallurgie Structurale, bâtiment 410, Université Paris XI, 91405 Orsay, France
2 Laboratoire de Chimie Physique Minérale et Bioinorganique, EA 401, Faculté de Pharmacie, 5 rue J.-B. Clément, 92296 Châtenay-Malabry, France
After having recalled the crystal structures of the three equilibrium phases of stoichiometric Au0.5Cu0.5 alloy, new results are presented in the frame of a general discussion on the transition series (with increasing temperature) :
AuCu I(LI0) → AuCu II → disordered AuCu (Al).
Both transitions have been followed by in-situ temperature X-ray, confirming earlier electron diffraction studies, and their transition enthalpies have been measured by differential scanning calorimetry. These results are commented, and a possible explanation for the large two-phase hysteresis (35°C) is proposed.
© EDP Sciences 2001