Abstract
Peak broadening and peak shifts of Bragg reflections were studied with the synchrotron single-crystal X-ray diffraction method for an Al 7 2 . 7 Ni 8 . 5 Co 1 8 decagonal quasicrystal classified as the 5f state. From the Q⊥and Q∥ dependences of the full width of half maximum (FWHM) of the Bragg reflections along the longitudinal direction, the coexistence of random phason strains with phonon strains was observed. High-resolution synchrotron X-ray measurements could present quantitative estimations of these strains. The value of the random phason strain component is 0.0054 ∼ τ - 1 1 . The asymmetrical broadening due to the phonon strain shows that the single crystal may be constructed with two kinds of grains that have A 5 D values of 0.6273 and 0.6265 nm.
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