Weidner, Eveline; Lei, J.-L.; Frey, Friedrich; Wang, R.; Grushko, B.
Diffuse scattering in decagonal Al-Ni-Fe.
In: Journal of Alloys and Compounds, Vol. 342, No. 1-2: pp. 156-158
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Significant diffuse scattering close to Bragg reflections was observed in decagonal Al 71.5Ni 23.5Fe 5 phase which is otherwise free of disorder phenomena. As found by synchrotron measurements (DESY, HASYLAB) this diffuse scattering is anisotropically distributed and dumb-bell shaped with a major extension parallel to the scattering vector Q and a typical 1/q 2 fall-off of the diffuse wings. The diffuse data were tentatively interpreted in frame of a TDS theory [Phys. Rev. B 59 (1999) 822] using only 2 (out of 5) phonon elastic constants, c 11 and c 66. A remarkable matching of observed and calculated diffuse data could be achieved, however, with an unusual (?) c 66/c 11 ratio equal to 4.0. An alternative interpretation is based on strain fields caused by static lattice distortions [Phys. Rev. B 37 (1988) 4458]. Possibly there is a superposition of both contributions.