Pressure-induced transformations in Ce-Al metallic glasses: The role of stiffness of interatomic pairs

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

  • Author: Dziegielewski, P.

    Warsaw University of Technology, Poland

  • Author: Antonowicz, J.

    Warsaw University of Technology, Poland

  • Author: Pietnoczka, A.

    Warsaw University of Technology, Poland

  • Author: Mathon, O.

    European Synchrotron Radiation Facility, France

  • Author: Pascarelli, S.

    European Synchrotron Radiation Facility, France

  • Author: Kantor, I.

    Neutrons and X-rays for Materials Physics, Department of Physics, Technical University of Denmark, Fysikvej, 2800, Kgs. Lyngby, Denmark

  • Author: Shinmei, T.

    Ehime University, Japan

  • Author: Irifune, T.

    Ehime University, Japan

View graph of relations

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.
Original languageEnglish
JournalJournal of Alloys and Compounds
Volume757
Pages (from-to)484-488
ISSN0925-8388
DOIs
Publication statusPublished - 2018
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

  • Extended X-ray absorption fine structure, (EXAFS), Metallic glass, Crystallization, High pressure

ID: 148848059