Volume 65, Number 1, January 2004
|Page(s)||34 - 40|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 December 2003|
Temperature dependence of the chemical short-range order in undercooled and stable -- liquids
Institut für Raumsimulation, DLR - D-51170 Köln, Germany
2 European Synchrotron Radiation Facility - B.P. 220, F-38043 Grenoble Cedex, France
3 Laboratoire Louis Néel - B.P. 166, F-38042 Grenoble Cedex 9, France
4 Centre d'Etudes Nucléaires de Grenoble, DRFMC/SPSMSD/MDM F-38054 Grenoble Cedex, France
5 Institut Laue-Langevin - B.P. 156, F-38042 Grenoble Cedex 9, France
Accepted: 3 November 2003
The temperature dependence of the chemical short-range order is investigated by neutron scattering in stable and undercooled metallic liquid alloys. The experiments were performed on -- liquids forming polytetrahedral phases and are in favour of an icosahedral topological short-range order prevailing in the liquids. The icosahedral short-range order is accompanied by a strong chemical order such that the first coordination shell of a transition metal atom consists preferentially of atoms. A decrease of temperature leads to an enhancement of the chemical short-range order.
PACS: 61.20.-p – Structure of liquids / 61.12.-q – Neutron diffraction and scattering / 61.25.Mv – Liquid metals and alloys
© EDP Sciences, 2004
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