Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 427, Issue -, Pages 104-113Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2015.07.036
Keywords
Amorphous Al-Zr; Metallic glass; Radial distribution function; Auger parameter; XPS; Thermal stability
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A comprehensive study of the atomic structure, electronic structure and thermal stability of sputter-deposited amorphous AlxZr1 - x (x = 0.26, 035, 0.51, 0.75) has been carried out using a combined experimental approach including X-ray diffraction (XRD) radial distribution function analysis, X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES), as well as in-situ high-temperature XRD investigations. It was found that am-AlxZr1 - x exhibits distinct short-range order, which changes with composition. The high nearest-neighbor coordination numbers (NNCNs) (>= 13) for the Al-rich am-AlxZr1 - x are consistent with the presence of distorted Frank-Kasper coordination polyhedra. Similarly, the NNCNs of the Zr-rich am-AlxZr1 - x (similar to 12) suggest the presence of mostly icosahedral clusters. XPS and AES analyses indicated that in am-AlxZr1 - x the Al atoms got electron charge of about 0.15e-0.19e from the Zr atoms. Hybridization of the outer-shell valence electrons of Al (3s, 3p) and Zr (4d) is established in am-AlxZr1 - x. The am-AlxZr1 - x with 49 at.% Zr possesses maximum thermal stability. The correlation of the observed thermal stability of am-AlxZr1 - x x alloys and their structure has been discussed. (C) 2015 Elsevier B.V. All rights reserved.
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