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Issue 8, 2019
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Structural origin of the high glass-forming ability of Ce70Ga10Cu20 alloys

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Abstract

The CeGaCu amorphous alloy has a good glass-forming ability and many special properties. However, its structure at the atomic scale is unclear. We systematically investigated the structure evolution of Ce70GaxCu30−x (x = 6, 10, 13) glass formation melts by ab initio molecular dynamics (AIMD) simulations. Based on the trajectories from the simulations, the pair-correlation function, coordination numbers, chemical short-range order, Voronoi polyhedra and electronic structures were discussed. Our results show that the concentration of Ga- and Cu-centered icosahedral (-like) clusters in Ce70Ga10Cu20 melts are larger than those in Ce70Ga6Cu24 and Ce70Ga13Cu17 melts. Furthermore, electronic analysis showed that the hybridization between Ga 4p and Cu 3d (Ce 5d) orbitals is strong and that of Cu 3d orbitals and Ga 4p orbitals was strengthened in Ce70Ga10Cu20 melts, which means that the interactions between Ga and Cu atoms nearby were enhanced in the Ce70Ga10Cu20 melts. The stability of the Ga- or Cu-centered icosahedral clusters increased accordingly, which favored their glass-forming ability. Our investigation helps people obtain an increased understanding of the glass-forming ability from the viewpoint of chemical interactions for metallic glasses.

Graphical abstract: Structural origin of the high glass-forming ability of Ce70Ga10Cu20 alloys

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Publication details

The article was received on 06 Dec 2018, accepted on 24 Jan 2019 and first published on 26 Jan 2019


Article type: Paper
DOI: 10.1039/C8CP07478J
Citation: Phys. Chem. Chem. Phys., 2019,21, 4209-4214

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    Structural origin of the high glass-forming ability of Ce70Ga10Cu20 alloys

    H. Chen, D. Li, Y. Zhao, B. Qu, R. Zhou and B. Zhang, Phys. Chem. Chem. Phys., 2019, 21, 4209
    DOI: 10.1039/C8CP07478J

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