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Single crystal neutron diffraction of decagonal Al72.5Co11Ni16.5

Zeitschrift Fur Kristallographie 212(2): 89-94

Autoren/Herausgeber: Hradil K
Frey F
Grushko B
Erschienen: 1997

A single crystal of the thermodynamically stable decagonal phase in the system Al-Ni-Co with the nominal composition Al72.5CO11Ni16.5 was first studied by neutron diffraction. The diffraction experiment showed that the investigated crystal was a true single crystal. In a preliminary experiment we have measured a selection of Bragg reflections, diffuse scattering and satellite scattering and compared the observations with corresponding X-ray results. From this comparison we may conclude, that the 10mm symmetry is not due to the indiscernibility of Co and Ni atoms (X-rays), but a true structure feature. The superorder satellite scattering is basically not due to a Co/Ni ordering problem.