Europhys. Lett., 63 (1) , pp. 69-75 (2003)
Hydrogen vibrations in austenitic fcc - - - steelsS. A. Danilkin1, H. Fuess2, H. Wipf2, A. Ivanov3, V. G. Gavriljuk4, D. Delafosse5 and T. Magnin5
1 Hahn-Meitner-Institut - 14109 Berlin, Germany
2 Technische Universität Darmstadt - 64289 Darmstadt, Germany
3 Institut Max von Laue-Paul Langevin - 38042 Grenoble Cedex 9, France
4 Institute for Metal Physics - 252142 Kiev, Ukraine
5 Ecole Nationale Supérieure des Mines de Saint-Etienne 42023 Saint-Etienne Cedex 2, France
(Received 7 October 2002; accepted in final form 30 April 2003)
By neutron spectroscopy, we studied vibrations of interstitials in two austenitic fcc steels ( and ) doped with 0.37 and 0.33 at% . The band modes, in which vibrates with its metal neighbours, cause a weak intensity in the energy range of the acoustic vibrations of the -free steels. The energies of the fundamental and the twofold local-mode excitations, in which vibrates against its metal neighbours, were and , respectively. The respective peaks in the spectra were broadened because the metal neighbours of , and thus its vibrational energies, vary from interstitial site to interstitial site. The above energy values support an occupation of octahedral interstitial sites.
63.20.Pw - Localized modes.
78.70.Nx - Neutron inelastic scattering.
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