Temperature dependence of the 8-Å superstructure in decagonal Al–Co–Ni

• Published in: Journal of alloys and compounds Vol. 342; no. 1; pp. 57 - 64
• Main Authors: Frey, F, Weidner, E, Hradil, K, de Boissieu, M, Letoublon, A, McIntyre, G, Currat, R, Tsai, A.-P
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 14-08-2002; Elsevier
• Subjects: Condensed matter: structure, mechanical and thermal properties; Decagonal quasicrystal; Diffuse layers; Exact sciences and technology; High temperature; Neutron diffraction; Periodic superstructure; Physics; Quasicrystals; Semi-periodic solids; Structure of solids and liquids; crystallography; Periodic superstructure; High temperature; Diffuse layers; Neutron diffraction; Decagonal quasicrystal; Aluminium base alloys; Nickel alloys; Ternary alloys; XRD; Experimental study; Solid structure; Cluster model; Temperature effects; Superstructure; Ordering; Decagonal phase; Cobalt alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/S0925-8388(02)00134-2

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.