Journal Article

PHPPUBDB-7412

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Local Atomic Order in Al-Based Metallic Glasses Studied Using XAFS Method

Zalewski, W. (Corresponding author)Extern* ; Antonowicz, J.Extern* ; Bacewicz, R.Extern* ; Latuch, J. ; DESY

2009
Elsevier Lausanne

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Please use a persistent id in citations: doi:10.1016/j.jallcom.2008.01.037

Abstract: Local atomic order in series of Al–(Y, Sm)–TM (TM = transition metal: Co, Ni) amorphous, melt-spun alloys was investigated by Sm$L_3$-edge and TM$K$-edge X-ray absorption fine structure (XAFS) method. The evaluated coordination number of Sm is approximately 16 for all investigated systems and TM coordination ranges form 5 to 6. A slight decrease in TM coordination along with increase of TM content is observed. The interatomic distances between Al and Sm atoms are equal to the sum of their metallic radii within the experimental error, while Al–TM bonds are shortened by 10%10%. The structural disorder around Sm atoms is significantly higher then around TM. We have found that only Al atoms are present in the first coordination shell of both Sm and TM species. The XAFS data show that the amorphous network coherency is lost at distances exceeding 4 Å. The results are discussed in a framework of Miracle’s structural model of metallic glasses suggesting that the average local structure around Sm atoms consists of 16 efficiently packed Al atoms in the first coordination shell of Sm and the TM atoms occupy the octahedral sites in the closely packed fcc cluster structure.

Note: (c) Elsevier B.V. Post referee full text in progress (embargo 1 year from 4 March 2008).

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Contributing Institute(s):

1. Experiments with synchrotron radiation (HASYLAB(-2012))

Research Program(s):

1. DORIS Beamline A1 (POF1-550) (POF1-550)

Experiment(s):

1. DORIS Beamline A1 (DORIS III)

Appears in the scientific report 2009
Notes: available on line from January,2008. (c) Elsevier. No copyright permission for full text. Volltexte zugaenglich via DESY, siehe DOI!

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Database coverage:
; JCR ; No Author Disambiguation ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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