Diffuse neutron scattering study of disordered Al 72 Co 16 Ni 12 quasicrystals up to 1000 �C

Disordered decagonal Al72Co16Ni12 quasicrystals were investigated by recording diffuse neutron scattering at instruments D10 and IN8/ILL up to 1000 °C. This neutron work supplements X-ray-diffraction investigations, which do not provide a scattering contrast of the transition metals. Moreover, diffuse scattering of inelastic origin could be suppressed, within the resolution limits, by using an analyser. The temperature dependence of the diffuse scattering in the quasiperiodic plane indicates complex re-ordering processes. A one-dimensional superorder along the unique axis, reflected by diffuse layers perpendicular to it, dissolves at 950 °C; short-range-order maxima remain visible at 980 °C.