Study of the Influence of the Chemical Bond on the Glass Forming Ability of Amorphous Alloys by X-ray Absorption Spectroscopy (XANES)
Abstract
This report results from a contract tasking ICMCB-CNRS as follows: One of the most appropriate techniques to study the structural features of amorphous materials and to characterize the electronic structure (chemical bond) is X-ray absorption spectroscopy near edge structure (XANES). Synchrotron radiation will be used to analyze the influence of the solutes on the XANES spectra of Zr-based metallic glasses. Quantum calculations based on the FLAPW (full potential linearized augmented plane wave) ab initio codes will be exploited for a quantitative analysis and calculation of the XANES spectra. Zr-based metallic glasses are of interest because they have good mechanical properties. This study will focus on Zr-Al-X glass forming systems, with X = Cu, Ni, Co or Fe, because they are topologically equivalent (since Ni, Cu, Co and Fe all have essentially identical radii), but exhibit very different glass forming abilities. Zr-Al-Ni is by far the best of these systems, and Zr-Al-(Cu,Ni) is much better than either Zr-Al-Ni or Zr-Al-Cu. The influence of chemical bonding is the likely explanation for these different behaviours in topologically equivalent glasses. A series of Zr-based bulk metallic glasses (Zr-Al-Cu, Zr-Al-Ni, Zr-Al-Cu-Ni) will be characterized by X(ray absorption spectroscopy and PPMS (Physical Properties Measurement System) in order to study the influence of the solute atom, X (with X = Cu, Ni), on the local order (atomic distances, nature and number of neighbour atoms), oxidation states, electronic structures and heat capacity.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 27, 2009
- Accession Number
- ADA530860
Entities
People
- A. Villesuzanne
- Stephane B. Gorsse
Organizations
- Institut de Chimie de la Matière Condensée de Bordeaux