Frey, Friedrich; Weidner, Eveline; Hradil, K.; Boissieu, M. de; Letoublon, A.; McIntyre, G.; Currat, R.; Tsai, A.-P.
Temperature dependence of the 8-Å superstructure in decagonal Al-Co-Ni.
In: Journal of Alloys and Compounds, Vol. 342, No. 1-2: pp. 57-64
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Diffuse layers corresponding to an 8 Å superperiod along the ’periodic’ axis of decagonal Al-Ni-Co phases were investigated by in situ X-ray and neutron diffraction at temperatures up to 980 °C. The diffuse layers consist of an unstructured diffuse background, diffuse bands, and diffuse maxima which (almost) all vanish above 900 °C, but show a different temperature dependence in detail. A tentative scenario of the related structural ordering process during cooling from high temperature is developed. A 1D-columnar cluster model is compared to the experimental results.