issue contents

ISSN: 2053-2733

July 2010 issue

Highlighted illustration

Cover illustration: A collage of related patterns that are formed via tilings of the hyperbolic plane. Two-dimensional `universal tilings' (e.g. UQC473) of hyperbolic space can be wrapped onto a three-periodic minimal surface (e.g. the  gyroid), forming a curvilinear `Epinet tiling' (EGC473) whose edges relax to give a `Systre net', sqc14527. This approach to net enumeration is described in Ramsden et al. [Acta Cryst. (2009), A65, 81-108]. Further examples are collected at

research papers

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Obviously erroneous structural models of tetrabutylammonium tetrabutylborate can have lower values of R and wR than the correct one.

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Extinction-free structure-factor phase and amplitude measurements by convergent-beam electron diffraction in GaN provide a map of the polar bonds.

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The effect of the total reflection of the incident beam into the 222 reflected beam in the Renninger (222/113) case in Si was experimentally observed by using a highly monochromatic beam with high angular collimation in both the vertical and horizontal planes.

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Accurate structure factors to high resolution can be obtained for small-unit-cell inorganic solids from synchrotron powder diffraction data measured in minutes.

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Surface effects in Laue diffraction of X-rays by crystals are investigated by means of Takagi–Taupin equations.

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It is observed experimentally that nanocrystals from II–VI compounds like CdS have a high density of stacking faults. It is argued that these are not crystal defects but rather represent a characteristic feature for such materials.

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A method for computing X-ray three-beam rocking curves is described. It is based on fast-Fourier-transforming X-ray amplitudes in pinhole topographs which were computer-simulated based on the Takagi–Taupin equation.

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Using a statistical approach, the structure factor for an arbitrarily decorated Penrose tiling was derived in physical space and used for the structure refinement of decagonal quasicrystals.

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An appreciable beating of the X-ray intensities may be induced by a lattice distortion that produces interbranch transformations of the local dispersion surface. In X-ray plane-wave topography, this effect may be observed as interference fringes arising around the kinematical image of a defect.
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