Quasi-elastic neutron scattering was used to study Ni self-diffusion in the B2-type compound. The results showed that the Ni atoms diffused via nearest-neighbour jumps, rather than via the next-nearest neighbour jump mechanism which had been proposed on the basis of tracer diffusion experiments. The residence time of the Ni atoms on the antistructure sites was deduced to be of the order of 1/10 of the residence time on the Ni sub-lattice. The vacancy concentration could then be estimated on the basis of this ratio.

Self-Diffusion in the B2-Ordered Alloy NiGa. M.Kaisermayr, J.Combet, B.Sepiol, H.Thiess, G.Vogl: Physica B, 2000, 276-278, 270-1