Volume 33, Number 9, March III 1996
|Page(s)||679 - 682|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
The pressure dependence of the Ta1 phonon frequencies in the ordered Invar alloy Fe3Pt at pressures up to 7 GPa
Institut für Angewandte Physik, Universität
Erlangen-Nürnberg 91054 Erlangen, Germany
2 Physique des Milieux Condensés, Université P. et M. Curie Tour 13, B77, 4 Place Jussieu, 75252 Paris, France
3 Laboratoire Léon Brillouin - 91191 Gif sur Yvette, France
4 Forschungszentrum Karlsruhe, Institut für Nukl. Festkörperphysik 76021 Karlsruhe, Germany
Accepted: 30 January 1996
The pressure dependence of the phonon frequencies in ordered was studied by inelastic neutron scattering up to 7 GPa. Very large frequency shifts () were observed in this pressure range. We found that the mode Grüneisen parameters remain very large () for pressures exceeding the critical pressure of about 3 GPa, which drives ordered from a high-spin to a low-spin state. This indicates that the unusually large Grüneisen parameters are probably not a magnetoelastic effect, but rather have to be associated with the martensitic instability.
PACS: 68.35.Rh – Phase transitions and critical phenomena
© EDP Sciences, 1996
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