Local atomic order, electronic structure and electron transport properties of Cu-Zr metallic glasses
- Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw (Poland)
- Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warsaw (Poland)
- Department of Physics, University of Ioannina, Ioannina 45110 (Greece)
We studied atomic and electronic structures of binary Cu-Zr metallic glasses (MGs) using combined experimental and computational methods including X-ray absorption fine structure spectroscopy, electrical resistivity, thermoelectric power (TEP) measurements, molecular dynamics (MD) simulations, and ab-initio calculations. The results of MD simulations and extended X-ray absorption fine structure analysis indicate that atomic order of Cu-Zr MGs and can be described in terms of interpenetrating icosahedral-like clusters involving five-fold symmetry. MD configurations were used as an input for calculations of theoretical electronic density of states (DOS) functions which exhibits good agreement with the experimental X-ray absorption near-edge spectra. We found no indication of minimum of DOS at Fermi energy predicted by Mott's nearly free electron (NFE) model for glass-forming alloys. The theoretical DOS was subsequently used to test Mott's model describing the temperature variation of electrical resistivity and thermoelectric power of transition metal-based MGs. We demonstrate that the measured temperature variations of electrical resistivity and TEP remain in a contradiction with this model. On the other hand, the experimental temperature dependence of electrical resistivity can be explained by incipient localization of conduction electrons. It is shown that weak localization model works up to relatively high temperatures when localization is destroyed by phonons. Our results indicate that electron transport properties of Cu-Zr MGs are dominated by localization effects rather than by electronic structure. We suggest that NFE model fails to explain a relatively high glass-forming ability of binary Cu-Zr alloys.
- OSTI ID:
- 22304308
- Journal Information:
- Journal of Applied Physics, Vol. 115, Issue 20; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ABSORPTION SPECTROSCOPY
COPPER COMPOUNDS
ELECTRIC CONDUCTIVITY
ELECTRON DENSITY
ELECTRONIC STRUCTURE
ELECTRONS
FINE STRUCTURE
GLASS
METALLIC GLASSES
MOLECULAR DYNAMICS METHOD
PHONONS
SIMULATION
SPECTRA
SYMMETRY
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
X RADIATION
X-RAY SPECTROSCOPY
ZIRCONIUM COMPOUNDS