Pressure-induced transformations in Ce-Al metallic glasses: The role of stiffness of interatomic pairs
Przemysław Dzięgielewski , Jerzy Antonowicz , Anna Pietnoczka , O. Mathon , S. Pascarelli , I. Kantor , T. Shinmei , T. Irifune
AbstractWhen 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.
|Journal series||Journal of Alloys and Compounds, ISSN 0925-8388, (A 35 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||Extended X-ray absorption fine structure (EXAFS) Metallic glass Crystallization High pressure|
|ASJC Classification||; ; ;|
|Score||= 35.0, 13-08-2019, ArticleFromJournal|
|Publication indicators||= 1; = 1; : 2016 = 1.321; : 2017 = 3.779 (2) - 2017=3.315 (5)|
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