Journal
MATERIALS TRANSACTIONS
Volume 45, Issue 4, Pages 1255-1260Publisher
JAPAN INST METALS
DOI: 10.2320/matertrans.45.1255
Keywords
quasicrystal; phason strain; phonion strain; decagonal phase; aluminum nickel cobalt alloy; synchrotron X-ray diffraction
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Peak broadening and peak shifts of Bragg reflections were studied with the synchrotron single-crystal X-ray diffraction method for an Al72.7Ni8.5Co18.8 decagonal quasicrystal classified as the 5f state. From the Q(perpendicular to) and Q(parallel to) 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 similar to tau(-11). The asymmetrical broadening due to the phonon strain shows that the single crystal may be constructed with two kinds of grains that have A(5D) values of 0.6273 and 0.6265 nm.
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