Phonons — A diffusion motor in intermetallics?

We search for the reason for the extraordinarily high diffusivity of Fe and Ni in the DO 3 intermetallics Fe 3Si and Ni 3Sb. Recent quasielastic neutron scattering and Mössbauer spectroscopy studies revealed the elementary diffusion jump mechanism: in stoichiometric Fe 3Si and in Ni 3Sb diffusion ta...

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Published in:Physica. B, Condensed matter Condensed matter, 1996-04, Vol.219 (1-4), p.499-501
Main Authors: Randl, O.G., Vogl, G., Petry, W.
Format: Article
Language:English
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Summary:We search for the reason for the extraordinarily high diffusivity of Fe and Ni in the DO 3 intermetallics Fe 3Si and Ni 3Sb. Recent quasielastic neutron scattering and Mössbauer spectroscopy studies revealed the elementary diffusion jump mechanism: in stoichiometric Fe 3Si and in Ni 3Sb diffusion takes place via nearest-neighbour jumps in the Fe/Ni sublattice. Considering this simple mechanism, the high diffusivities remain puzzling. Measurements of the phonon dispersion have been performed in order to check if diffusion in these intermetallics is phonon-assisted as in the high-temperature phases of the Ti-group metals. The migration barriers of low energy derived from the phonon data allow to draw clear conclusions on the reason for fast diffusion in these alloys.
ISSN:0921-4526
1873-2135
DOI:10.1016/0921-4526(95)00791-1