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Origin of Pressure-Induced Polyamorphism in Ce[subscript 75]Al[subscript 25] Metallic Glass

Journal Article · · Phys. Rev. Lett.
Using high-pressure synchrotron x-ray absorption spectroscopy, we observed the Ce 4f electron in Ce{sub 75}Al{sub 25} metallic glass transform from its ambient localized state to an itinerant state above 5 GPa. A parallel x-ray diffraction study revealed a volume collapse of about 8.6%, coinciding with 4f delocalization. The transition started from a low-density state below 1.5 GPa, went through continuous densification ending with a high-density state above 5 GPa. This new type of electronic polyamorphism in densely packed metallic glass is dictated by the Ce constituent, and is fundamentally distinct from the well-established structural polyamorphism in which densification is caused by coordination change and atomic rearrangement.
Research Organization:
Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
Sponsoring Organization:
USDOE
OSTI ID:
1002308
Journal Information:
Phys. Rev. Lett., Journal Name: Phys. Rev. Lett. Journal Issue: (10) ; 03, 2010 Vol. 104; ISSN 0031-9007; ISSN PRLTAO
Country of Publication:
United States
Language:
ENGLISH

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