Temperature dependence of the chemical short-range order in undercooled and stable - - liquidsT. Schenk1, 2, V. Simonet3, D. Holland-Moritz1, R. Bellissent4, T. Hansen5, P. Convert5 and D. M. Herlach1
1 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
(Received 14 July 2003; accepted in final form 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.
61.20.-p - Structure of liquids.
61.12.-q - Neutron diffraction and scattering.
61.25.Mv - Liquid metals and alloys.
© EDP Sciences 2004