Thermodynamic Stability and Melting Mechanism of Bimetallic Au-Pt Nanoparticles
Por:
Liu H.B., Pal U., Ascencio J.A.
Publicada:
11 dic 2008
Resumen:
Classical molecular dynamics simulations were carried out to study the thermodynamic stability and melting behavior of Au-Pt nanoclusters of most common structural variants like decahedra, icosahedra, and cuboctahedra. It has been shown that the Pt-core/Au-shell structures are most stable, while the eutectic-like structures are more stable than solid solution ones, and the Au-core/Pt-shell are least stable, on thermal heating. On the other hand, the large difference between the melting points of the constituent elements can be a dominating factor on the melting mechanism of the bimetallic nanoparticles. The bimetallic clusters transform to the most stable Pt-core/Au-shell structure from whatever initial structures on heating above certain temperatures.
Filiaciones:
Liu H.B.:
Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas No. 152, Col. San Bartolo Atepehuacan, C.P. 07730, Mexico D.F., Mexico
Pal U.:
Instituto de Física, Universidad Autónoma de Puebla, Apdo. Postal J-48, Puebla 72570, Mexico
Ascencio J.A.:
Univ Nacl Autonoma Mexico, Inst Ciencias Fis, Cuernavaca 62210, Morelos, Mexico
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