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.
- Extended X-ray absorption fine structure
- Metallic glass
- High pressure
Dziegielewski, P., Antonowicz, J., Pietnoczka, A., Mathon, O., Pascarelli, S., Kantor, I., Shinmei, T., & Irifune, T. (2018). Pressure-induced transformations in Ce-Al metallic glasses: The role of stiffness of interatomic pairs. Journal of Alloys and Compounds, 757, 484-488. https://doi.org/10.1016/j.jallcom.2018.05.077