Abstract
Nanostructured materials exhibit remarkable properties significantly different from their bulk counterparts. Metal alloys at the nanoscale show an impressive potential to produce new systems having well-designed functionalities. By using a nanothermodynamic approach, here, we present the effects of the size and shape of the nanoparticles (NPs) on the phase diagrams (PDs) of the Mo-M (M = Nb, Ta, and W) alloys. A well-known group of morphologies at 50, 20, and 10 nm in diameter was considered, which are as follows: tetrahedron, cube, octahedron, decahedron, dodecahedron, cuboctahedron, rhombic dodecahedron, sphere, icosahedron, and truncated octahedron. From an examination of the liquidus and solidus curves, we calculated the expansion or contraction of the coexistence solid-liquid region of the PDs and how these changes are related to the size and shape of the NPs. Through a detailed Gibbs free energy (GFE) analysis, we also determined the thermal stability of the three Mo-based nanoalloys as a function of the size (10–50 nm) of the mentioned polyhedra, by fixing the temperature and the chemical composition. Finally, the surface segregated element was predicted in each bimetallic system.
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Abbreviations
- NP:
-
Nanoparticle
- PD:
-
Phase diagram
- GFE:
-
Gibbs free energy
- MD:
-
Molecular dynamics
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We thank Roxana M. Calderón-Olvera for her assistance in making the graphs.
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This work was supported by the PAPIIT Project IN113017. RMP also would like to acknowledge financial support from the DGAPA-UNAM postdoctoral grant.
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Mendoza-Pérez, R., Muhl, S. Phase diagrams of refractory bimetallic nanoalloys. J Nanopart Res 22, 306 (2020). https://doi.org/10.1007/s11051-020-05035-x
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DOI: https://doi.org/10.1007/s11051-020-05035-x