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• W1995736654 abstract "The Ag–Ni system is characterized by large differences in atomic sizes (14%) and a positive heat of mixing (+23 kJ mol−1). The binary equilibrium diagram for this system therefore exhibits a large miscibility gap in both solid and liquid state. This paper explores the size-dependent changes in microstructure and the suppression of the miscibility gap which occurs when free alloy particles of nanometer size are synthesized by co-reduction of Ag and Ni metal precursors. The paper reports that complete mixing between Ag and Ni atoms could be achieved for smaller nanoparticles (<7 nm). These particles exhibit a single-phase solid solution with face-centered cubic (fcc) structure. With increase in size, the nanoparticles revealed two distinct regions. One of the regions is composed of pure Ag. This region partially surrounds a region of fcc solid solution at an early stage of decomposition. Experimental observations were compared with the results obtained from the thermodynamic calculations, which compared the free energies corresponding to a physical mixture of pure Ag and Ni phases and a fcc Ag–Ni solid solution for different particle sizes. Results from the theoretical calculations revealed that, for the Ag–Ni system, solid solution was energetically preferred over the physical mixture configuration for particle sizes of 7 nm and below. The experimentally observed two-phase microstructure for larger particles was thus primarily due to the growth of Ag-rich regions epitaxially on initially formed small fcc Ag–Ni nanoparticles." @default.
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• W1995736654 date "2011-09-01" @default.
• W1995736654 modified "2023-10-01" @default.
• W1995736654 title "Size dependent microstructure for Ag–Ni nanoparticles" @default.
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• W1995736654 doi "https://doi.org/10.1016/j.actamat.2011.07.022" @default.
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