Journal: Acta Crystallographica Section A: Foundations and Advances

Abbreviation

Acta Cryst. A

Publisher

Wiley

Journal Volumes

ISSN

2053-2733

Description

Filters

2016 - 201942020 - 20212
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Publications 1 - 6 of 6
  • Quasicrystal-related mosaics with periodic lattices interlaid with aperiodic tiles
    Item type: Journal Article
    He, Zhanbing; Shen, Yihan; Ma, Haikun; et al. (2020)
    Acta Crystallographica Section A: Foundations and Advances
  • High-speed tensor tomography: iterative reconstruction tensor tomography (IRTT) algorithm
    Item type: Journal Article
    Gao, Zirui; Guizar-Sicairos, Manuel; Lutz-Bueno, Viviane; et al. (2019)
    Acta Crystallographica Section A: Foundations and Advances
  • Quasicrystals: What do we know? What do we want to know? What can we know?
    Item type: Review Article
    Steurer, Walter (2018)
    Acta Crystallographica Section A: Foundations and Advances
    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.
  • High-resolution XRD investigation of SiGe/Si heterostructures for novel X-ray detectors
    Item type: Other Conference Item
    Marozau, Ivan; Isa, Fabio; Jung, Arik; et al. (2016)
    Acta Crystallographica Section A: Foundations and Advances
  • Small-angle X-ray scattering tensor tomography: Model of the three-dimensional reciprocal-space map, reconstruction algorithm and angular sampling requirements
    Item type: Journal Article
    Liebi, Marianne; Georgiadis, Marios; Kohlbrecher, Joachim; et al. (2018)
    Acta Crystallographica Section A: Foundations and Advances
    Small-angle X-ray scattering tensor tomography, which allows reconstruction of the local three-dimensional reciprocal-space map within a three-dimensional sample as introduced by Liebi et al. [Nature (2015), 527, 349–352], is described in more detail with regard to the mathematical framework and the optimization algorithm. For the case of trabecular bone samples from vertebrae it is shown that the model of the three-dimensional reciprocal-space map using spherical harmonics can adequately describe the measured data. The method enables the determination of nanostructure orientation and degree of orientation as demonstrated previously in a single momentum transfer q range. This article presents a reconstruction of the complete reciprocal-space map for the case of bone over extended ranges of q. In addition, it is shown that uniform angular sampling and advanced regularization strategies help to reduce the amount of data required.
  • Gummelt versus Lück decagon covering and beyond. Implications for decagonal quasicrystals
    Item type: Journal Article
    Steurer, Walter (2021)
    Acta Crystallographica Section A: Foundations and Advances
    Specific structural repeat units can be used as quasi-unit cells of decagonal quasicrystals. So far, the most famous and almost exclusively employed one has been the Gummelt decagon. However, in an increasing number of cases Lück decagons have been found to be more appropriate without going into depth. The diversities and commonalities of these two basic decagonal clusters and of some more general ones are discussed. The importance of the type of underlying tiling for the correct classification of a quasi-unit cell is demonstrated.
Publications 1 - 6 of 6