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The growth of decagonal Al–Co–Ni single crystals as a function of chemical composition

Published online by Cambridge University Press:  31 January 2011

B. Zhang
Affiliation:
Laboratory of Crystallography, ETH Zentrum, CH-8092 Zurich, Switzerland
M. Estermann
Affiliation:
Laboratory of Crystallography, ETH Zentrum, CH-8092 Zurich, Switzerland
W. Steurer
Affiliation:
Laboratory of Crystallography, ETH Zentrum, CH-8092 Zurich, Switzerland
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Abstract

Decaprismatic single crystals taken from a series of alloys of nominal compositions within Al65–77Co3–22Ni3–22 have been studied by means of x-ray diffraction techniques. The substitution of Co by Ni in increasing amounts changes the (pseudo)decagonal diffraction patterns drastically and indicates structural changes which range from a single-crystalline approximant via orientationally ordered nanodomain structures and quasiperiodic phases with different types of ordering phenomena, to a basic decagonal phase. A quantum phase diagram analysis shows a clear separation of the stability regions of the ternary systems described in this study and other decagonal phases.

Type
Articles
Copyright
Copyright © Materials Research Society 1997

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