Structural changes of the metallic glass Zr{sub 65}Al{sub 7.5}Cu{sub 27.5} during glass transition and in the undercooled liquid region
- Institut fuer Physik, Universitaet Augsburg, D-86135 Augsburg (Germany)
- Philips RHW, D-22502 Hamburg (Germany)
- LURE, Centre Universitaire Paris-Sud, F-91405 Orsay Cedex (France)
The metallic glass Zr{sub 65}Al{sub 7.5}Cu{sub 27.5} exhibits a wide temperature range in the undercooled liquid region. This offers the possibility of examining the phenomena that occur during glass transition. We investigated this glass by x-ray diffraction and x-ray absorption spectroscopy (XAS) at room temperature and at elevated temperatures below and above the glass transition temperature. The total number of nearest neighbors determined by x-ray diffraction remained unchanged. Using XAS irreversible changes in the short range order (SRO) towards the SRO of crystalline Zr{sub 2}Cu is observed in the nearest neighbor shell which is consistent with the x-ray diffraction results. The long range order was not affected by these changes. From the temperature dependence of the atomic mean-square relative displacements {sigma}{sup 2}, Debye temperatures were determined and they compare well with low temperature specific heat measurements. Above T{sub g} the slope of {sigma}{sup 2} increases drastically and is attributed to anharmonic effects. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 530035
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 1 Vol. 82; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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