✦ LIBER ✦

New enthalpies determination and in situ X-ray diffraction observations of order/disorder transitions in Au0.5Cu0.5

✍ Scribed by Y. Feutelais; B. Legendre; M. Guymont

Book ID: 104403858
Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 235 KB
Volume: 47
Category: Article
ISSN: 1359-6454
DOI: 10.1016/s1359-6454(99)00089-0

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✦ Synopsis

AbstractÐDierential scanning calorimetry (DSC) and in situ X-ray diraction experiments on stoichiometric AuCu are reported. Enthalpy peaks of successive transitions AuCu I (L1 0 ) 4 AuCu II and AuCu II 4 disorder (A1) are observed, and their integration leads to DH values of 2.5 and 9.4 J/g, respectively. These successive transitions are well seen in in situ diraction. Each transformation is spread over a temperature range, and it is shown that the transition AuCu I (L1 0 ) 4 AuCu II starts at a temperature as low as 3508C. Some kinetic studies were performed. The long-range order parameter evolution against time is estimated for the ordering at 3008C into L1 0 from quenched disordered AuCu. The AuCu I (L1 0 ) 4 AuCu II was also studied from a kinetic point of view, using the intensities of characteristic lines. Various results are compared with previously reported observations and discussed.

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