Acta Crystallographica Section A

Foundations of Crystallography

Volume 66, Part 1 (January 2010)



[Issue Author Index][Volume Author Index]
[Cover 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 http://epinet.anu.edu.au.

feature articles


thumbnail of article figure

[HTML version][PDF version]  [Open access]

Acta Cryst. (2010). A66, 1-4  [ doi:10.1107/S0108767309041853 ]

The birth of the European Crystallographic Committee (ECC) and of the European Crystallographic Meetings (ECMs)

A. Authier

Synopsis: This article describes the circumstances of the establishment of the European Crystallographic Committee, now the European Crystallographic Association, a regional associate of the IUCr, and of the European Crystallographic Meetings.

Online 5 December 2009


research papers


thumbnail of article figure

[HTML version][PDF version]  [Buy article online]

Acta Cryst. (2010). A66, 5-9  [ doi:10.1107/S0108767309044183 ]

Dense quasicrystalline tilings by squares and equilateral triangles

M. O'Keeffe and M. M. J. Treacy

Synopsis: A new method of generating quasicrystalline patterns with 12-fold symmetry from tilings by squares and equilateral triangles is described.

Online 5 December 2009


thumbnail of article figure

[HTML version][PDF version]  [Buy article online]

Acta Cryst. (2010). A66, 10-16  [ doi:10.1107/S0108767309039750 ]

Effect of convergent beam semiangle on image intensity in HAADF STEM images

K. Kuramochi, Y. Kotaka, T. Yamazaki, M. Ohtsuka, I. Hashimoto and K. Watanabe

Synopsis: It is found that the intensities of bright spots in a spherical aberration (Cs)-uncorrected high-angle annular dark-field (HAADF) scanning transmission electron microscope (STEM) image of [011]-oriented Co3O4 change with sample thickness. From an analysis based on the Bloch-wave theorem, it is found that an insufficient semiangle of the incident convergent beam leads to intensities that do not depend on the average atomic number in the atomic columns.

Online 5 December 2009


thumbnail of article figure

[HTML version][PDF version]  [Buy article online]

Acta Cryst. (2010). A66, 17-21  [ doi:10.1107/S010876730904522X ]

A neutron interferometric measurement of a phase shift induced by Laue transmission

J. Springer, M. Zawisky, H. Lemmel and M. Suda

Synopsis: The phase shift of the transmitted neutron beam in Laue geometry is investigated by neutron interferometry.

Online 11 December 2009


thumbnail of article figure

[HTML version][PDF version]  [Buy article online]

Acta Cryst. (2010). A66, 22-31  [ doi:10.1107/S0108767309045206 ]

The long-wavelength limit of the structure factor of amorphous silicon and vitreous silica

A. M. R. de Graff and M. F. Thorpe

Synopsis: The structure factors for amorphous silicon and vitreous silica are determined in the long-wavelength limit from large computer models and compared with available experiments.

Online 11 December 2009


thumbnail of article figure

[HTML version][PDF version]  [Buy article online]

Acta Cryst. (2010). A66, 32-37  [ doi:10.1107/S0108767309041749 ]

Reconstruction from a single diffraction pattern of azimuthally projected electron density of molecules aligned parallel to a single axis

D. K. Saldin, V. L. Shneerson, D. Starodub and J. C. H. Spence

Synopsis: The azimuthally projected electron density of an isolated molecule of high degree of rotational symmetry about an alignment axis may be reconstructed by an iterative phasing algorithm applied to the diffuse diffraction pattern from an ensemble and beam incidence normal to the molecular alignment axis.

Online 5 December 2009


thumbnail of article figure

[HTML version][PDF version][Supplementary Material]  [Buy article online]

Acta Cryst. (2010). A66, 38-49  [ doi:10.1107/S0108767309046777 ]

Molecular crystal global phase diagrams. II. Reference lattices

R. B. McClurg and J. B. Keith

Synopsis: Experimental crystal structures that are amenable for inclusion in global phase diagrams as previously developed are identified.

Online 17 December 2009


thumbnail of article figure

[HTML version][PDF version][Supplementary Material]  [Buy article online]

Acta Cryst. (2010). A66, 50-63  [ doi:10.1107/S0108767309047643 ]

Molecular crystal global phase diagrams. III. Sufficient parameter space determination

J. B. Keith and R. B. McClurg

Synopsis: A small number of parameters describe a rich variety of phases in tetrahedral molecular crystals found in the Cambridge Structural Database.

Online 17 December 2009


thumbnail of article figure

[HTML version][PDF version]  [Buy article online]

Acta Cryst. (2010). A66, 64-77  [ doi:10.1107/S0108767309039890 ]

A new approach to calculating powder diffraction patterns based on the Debye scattering equation

N. W. Thomas

Synopsis: A method is described for the calculation of X-ray or neutron diffraction patterns of conventional crystalline powders based on the Debye scattering equation. Full background and reflection profiles are generated, whereby the effects of crystallite size and static and thermal disorder are also taken into account.

Online 5 December 2009


thumbnail of article figure

[HTML version][PDF version]  [Buy article online]

Acta Cryst. (2010). A66, 78-92  [ doi:10.1107/S0108767309038744 ]

X-ray constrained unrestricted Hartree-Fock and Douglas-Kroll-Hess wavefunctions

M. Hudák, D. Jayatilaka, L. Perasínová, S. Biskupic, J. Kozísek and L. Bucinský

Synopsis: The X-ray constrained unrestricted Hartree-Fock approach at the Douglas-Kroll-Hess and the nonrelativistic level of theory is presented. The relativistic and X-ray constraint effects in structural data, electron and spin density are reported.

Online 5 December 2009


thumbnail of article figure

[HTML version][PDF version]  [Buy article online]

Acta Cryst. (2010). A66, 93-97  [ doi:10.1107/S0108767309044791 ]

Low-angle scattering by cylindrical structures

G. B. Mitra

Synopsis: Scattering at small angles for cylindrical tubules has been theoretically studied. From the intensities at second angles of scattering, physical and chemical parameters of the tubules can be determined.

Online 11 December 2009


international union of crystallography


 

[HTML version][PDF version][Supplementary Material]  [Open access]

Acta Cryst. (2010). A66, 98-126  [ doi:10.1107/S0108767309019321 ]

Report of the Executive Committee for 2008

Online 11 December 2009


 

[HTML version][PDF version]  [Open access]

Acta Cryst. (2010). A66, 127  [ doi:10.1107/S0108767309050636 ]

Nominations for the Ewald Prize

Online 11 December 2009


 

[HTML version][PDF version]  [Open access]

Acta Cryst. (2010). A66, 128-132  [ doi:10.1107/S0108767309047862 ]

Notes for authors 2010

Online 17 December 2009


Copyright © International Union of Crystallography
IUCr Webmaster