Abstract
X-ray diffraction and transmission electron microscope (TEM) measurements were performed on icosahedral A1Mn and A1MnSi samples. Quasicrystalline order was obtained via different sample treatments: quenching, laser annealing, and furnace annealing of amorphous samples. In quenched bulk AIMn samples, the icosahedral grains are embedded in a crystalline Al matrix. The Al matrix is strongly reduced or rendered noncrystalline by the addition of Si. Samples prepared by laser annealing and quenching show a high degree of disorder. This shows up, in x-ray diffraction, as a large average peak line width. The furnace annealed samples show apparent homogeneous grains by TEM darkfield methods, and the smallest peak widths in x-ray diffraction. However, the grain sizes are much larger than the x-ray correlation lengths. These samples have peak widths which correlate strongly with G⊥ (phason momentum). We show that the data are consistent with either frozen-in phason strain or random icosahedral packing. These two models predict surprisingly similar but potentially distinguishable scattering widths, differing in their detailed dependence on G⊥ .
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© 1987 Springer-Verlag Berlin Heidelberg
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Horn, P.M., Malzfeldt, W., Divincenzo, D.P., Toner, J., Gambino, R. (1987). Systematics of Disorder in Quasiperiodic Material. In: Bishop, A.R., Campbell, D.K., Kumar, P., Trullinger, S.E. (eds) Nonlinearity in Condensed Matter. Springer Series in Solid-State Sciences, vol 69. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-83033-4_38
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DOI: https://doi.org/10.1007/978-3-642-83033-4_38
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-83035-8
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