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Article Dans Une Revue Journal of Alloys and Compounds Année : 2018

Stability of nanostructured silver-platinum alloys

Résumé

The stability of Ag-Pt systems: 13-atoms icosahedral cluster model (Ag13-nPtn) and 54-atoms (111) surface slab model (45Ag9Pt) have been systematically investigated by using Density Functional Theory within the generalized gradient approximation (DFT-GGA). Experimentally tested resistance of AgPt alloy nanoparticles supported on silica to decay upon temperature treatment (423 K-573 K in N2 flow) have shown to correlate with theoretical results. The stability of the clusters as a function of AgPt composition decreases with increasing content of Pt. The general stability trend of the AgPt alloy was maintained, in theory and experiment, for the Ag/Pt molar ratio of 1.6-5.1. Two particularly stable Ag/Pt compositions were revealed: 1.6 and 0.4. It was also found that surface location of platinum is responsible for stabilization of the Ag-Pt nanostructured alloy.
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Dates et versions

hal-01864134 , version 1 (02-01-2021)

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Joanna Wisniewska, Hazar Guesmi, Maria Ziolek, Frederik Tielens. Stability of nanostructured silver-platinum alloys. Journal of Alloys and Compounds, 2018, 770, pp.934-941. ⟨10.1016/j.jallcom.2018.08.208⟩. ⟨hal-01864134⟩
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