Self-diffusion in the B2-ordered alloy NiGa

Self-diffusion in the B2-ordered alloy NiGa

Quasielastic neutron scattering (QNS) has been used to investigate the self-diffusion of Ni in the intermetallic B2-compound NiGa. Our studies have shown that the Ni-atoms diffuse via nearest-neighbour jumps in contrast to the next-nearest-neighbour jump mechanism proposed on the basis of tracer dif...

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Veröffentlicht in:Physica. B, Condensed matter Condensed matter, 1999-09, Vol.276-278, p.270-271
Hauptverfasser: Kaisermayr, M, Combet, J, Sepiol, B, Thiess, H, Vogl, G
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Sprache:eng
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Zusammenfassung:Quasielastic neutron scattering (QNS) has been used to investigate the self-diffusion of Ni in the intermetallic B2-compound NiGa. Our studies have shown that the Ni-atoms diffuse via nearest-neighbour jumps in contrast to the next-nearest-neighbour jump mechanism proposed on the basis of tracer diffusion experiments. The residence time of the Ni-atoms on the antistructure sites has been found to be of the order of 1/10 of the residence time on the Ni- sublattice. From this proportion the vacancy concentration has been derived.
ISSN:0921-4526