Structure of the pseudodecagonal Al–Co–Ni approximant PD4
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry2006 (English)In: Philosophical Magazine, ISSN 1478-6435, E-ISSN 1478-6443, Vol. 86, no 3-5, 457-462 p.Article in journal (Refereed) Published
A model for the pseudodecagonal approximant PD4 in the Al–Co–Ni system was deduced from single crystal X-ray diffraction data. The space group is Bbmm with a ?=?101.3, b ?=?32.1 and c ?=?4.1?Å. Atomic positions of 133 unique atoms in the unit cell with a reasonable geometry were found by direct methods and the difference Fourier syntheses. The obtained structure model is in good agreement with high-resolution electron microscopy images of PD4. Diffuse scattering observed along the a * direction in the hkl layers with l ?=?1/2, 3/2 etc. indicates a superstructure with a doubling of the periodicity along the c -axis and a lamellar disorder along the a -axis. If this diffuse scattering is taken into account, c ?=?8.2?Å.
Place, publisher, year, edition, pages
Taylor and Francis , 2006. Vol. 86, no 3-5, 457-462 p.
IdentifiersURN: urn:nbn:se:su:diva-25272DOI: 10.1080/14786430500270343OAI: oai:DiVA.org:su-25272DiVA: diva2:199278
Part of urn:nbn:se:su:diva-7912006-01-052006-01-052010-12-14Bibliographically approved