Journal article
Pressure-induced transformations in Ce-Al metallic glasses: The role of stiffness of interatomic pairs
When high pressure is applied to Ce-Al metallic glasses, their disordered atomic structure exhibits some unusual properties like polyamorphism or transformation into a crystalline phase. In this work, we probe the atomic arrangement of Ce55Al45 and Ce75Al25 glasses by X-ray absorption spectroscopy and X-ray diffraction in the pressure range of 0–30 GPa.
The pressure-dependent parameters of local environment of cerium atoms are evaluated by extended X-ray absorption fine structure (EXAFS) fitting. We demonstrate that due to compositional dependence of stiffness of Ce-Al pairs, densification of Ce55Al45 is accompanied by an increase of atomic size mismatch between Ce and Al stabilizing the amorphous phase, while a decrease of the mismatch is observed in Ce75Al25 alloy which eventually leads to its devitrification at 25 GPa.
Language: | English |
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Year: | 2018 |
Pages: | 484-488 |
ISSN: | 18734669 and 09258388 |
Types: | Journal article |
DOI: | 10.1016/j.jallcom.2018.05.077 |
ORCIDs: | 0000-0002-7781-7540 and Kantor, I. |
(EXAFS) Crystallization Extended X-ray absorption fine structure High pressure Metallic glass