Dynamical x-ray diffraction from an icosahedral quasicrystal

Kycia, S.; Goldman, A. I.; Lograsso, Thomas A.; Delaney, D.W.; Black, David R.; Sutton, M.; Đufresne, Eric M.; Brüning, Ralf; Rodricks, Brian G.

doi:10.1103/physrevb.48.3544

Cited by 117 publications

(51 citation statements)

References 11 publications

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“…With a thickness of 0.385 mm, the product "t amounts to 20.19, and the normal absorption coef®cient exp À"t is in the neighborhood of 1X7 Â 10 À9 . This is a much more stringent condition than the one used in the previous experiment by Kycia et al (1993). They used higher X-ray energy (E = 12 keV).…”

Section: Acta Cryst (2002) A58 385±390mentioning

confidence: 98%

“…They showed that the conditions for AT can be realized even in such a situation. The experimental veri®cation was obtained a few years later by Kycia et al (1993). No attempt was made, however, to put the measurements on an absolute scale and to compare with theory.…”

Section: Anomalous Transmission ± Experimentalmentioning

confidence: 99%

“…A sensitive test of the accuracy of Boudard et al's (1992) model would be a diffraction experiment involving low-Q re¯ections, under conditions in which lattice imperfections could not play any role. The best quasicrystals available are Al±Pd±Mn alloys, which have been proved to exhibit anomalous transmission (Kycia et al, 1993) and to yield rocking curves that are extremely sharp, 32 HH wide (Lee et al, 1996). Under the assumption that a good quasicrystalline specimen of Al±Pd± Mn diffracts as a perfect crystal, a Bragg-case diffraction experiment from a polished strain-free surface should yield a beam whose intensity can be calculated from ®rst principles using dynamical theory.…”

Section: Introductionmentioning

confidence: 99%

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Absolute structure-factor measurements of an Al–Pd–Mn quasicrystal

et al. 2002

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A number of X-ray re¯ections from an icosahedral quasicrystal Al±Pd±Mn have been measured with great accuracy on an absolute basis by making use of Braggcase diffraction. Since the specimen had high crystal quality, the dynamical theory was used for analyzing the results and to extract structure factors from measured integrated intensities. Good agreement was found between theory and experiment for strong re¯ections. Anomalous transmission was found to be strong in the`good' regions of the quasicrystalline specimen and it was measured on an absolute basis, but the small residual strains present in the specimen prevented an accurate comparison between theory and experiment. A detailed discussion is presented on the parameters that mostly affect anomalous transmission in relationship to the adopted structural model.

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Section: Acta Cryst (2002) A58 385±390mentioning

confidence: 98%

Section: Anomalous Transmission ± Experimentalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Absolute structure-factor measurements of an Al–Pd–Mn quasicrystal

et al. 2002

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“…Dynamical diffraction in quasicrystals has been observed in the icosahedral quasicrystal AlPdMn as the Bormann effect by Kycia et al [18]. Lee et al have observed three-beam diffraction effects in quasicrystals [9].…”

Section: (Received 28 August 1998)mentioning

confidence: 86%

Dynamical Diffraction and X-Ray Standing Waves from Atomic Planes Normal to a Twofold Symmetry Axis of the Quasicrystal AlPdMn

et al. 1999

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“…Here it should be mentioned that the structural perfection of QCs can be comparable with that of periodic complex intermetallics in general. Consequently, dynamical-diffraction phenomena such as multiple diffraction are quite common; anomalous transmission effects have also been observed (see, e.g., Kycia et al, 1993). This indicates a high perfection of at least the quasiperiodic average structure, without saying anything about the possible deviations from it.…”

Section: Structure Of Quasicrystalsmentioning

confidence: 96%

Quasicrystals: What do we know? What do we want to know? What can we know?

Steurer

2018

Acta Cryst Sect A

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More than 35 years and 11 000 publications after the discovery of quasicrystals by Dan Shechtman, quite a bit is known about their occurrence, formation, stability, structures and physical properties. It has also been discovered that quasiperiodic self-assembly is not restricted to intermetallics, but can take place in systems on the meso-and macroscales. However, there are some blank areas, even in the centre of the big picture. For instance, it has still not been fully clarified whether quasicrystals are just entropy-stabilized high-temperature phases or whether they can be thermodynamically stable at 0 K as well. More studies are needed for developing a generally accepted model of quasicrystal growth. The state of the art of quasicrystal research is briefly reviewed and the main as-yet unanswered questions are addressed, as well as the experimental limitations to finding answers to them. The focus of this discussion is on quasicrystal structure analysis as well as on quasicrystal stability and growth mechanisms.

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Dynamical x-ray diffraction from an icosahedral quasicrystal

Cited by 117 publications

References 11 publications

Absolute structure-factor measurements of an Al–Pd–Mn quasicrystal

Absolute structure-factor measurements of an Al–Pd–Mn quasicrystal

Dynamical Diffraction and X-Ray Standing Waves from Atomic Planes Normal to a Twofold Symmetry Axis of the Quasicrystal AlPdMn

Quasicrystals: What do we know? What do we want to know? What can we know?

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