[IUCr 2014 Congress]

Acta Crystallographica Section A

Foundations of Crystallography

Volume 69, Part 6 (November 2013)



[Issue Author Index][Volume Author Index]
[Cover illustration] Cover illustration: Experimental charge-density studies of heavy-element, inorganic solids are highly challenging. The experimental static deformation density in a plane for such a compound, CoSb3, is shown. The positive features in between Co and Sb indicate a covalent character of the Co-Sb bond [Schmøkel et al. (2013). Acta Cryst. A69, 570-582].

editorial


 

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Acta Cryst. (2013). A69, 533-534  [ doi:10.1107/S0108767313023702 ]

A new vision for Acta Crystallographica Section A

S. J. L. Billinge and J. Miao

Synopsis: The scope of Acta Crystallographica Section A is outlined and new section for high-impact articles, Advances, is announced.

Online 17 October 2013


research papers


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Acta Cryst. (2013). A69, 535-542  [ doi:10.1107/S0108767313020655 ]

Nets with collisions (unstable nets) and crystal chemistry

O. Delgado-Friedrichs, S. T. Hyde, S.-W. Mun, M. O'Keeffe and D. M. Proserpio

Synopsis: Examples are given of nets describing the topology of real crystal structures in which groups of vertices collide in barycentric coordinates and in high-symmetry embeddings.

Online 12 September 2013


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Acta Cryst. (2013). A69, 543-548  [ doi:10.1107/S0108767313022733 ]

Homometry in the light of coherent beams

S. Ravy

Synopsis: Two systems are homometric if they are indistinguishable by diffraction. This article mainly discusses the issue of diffuse scattering homometry and its relation to high-order correlation functions. The study of the Rudin-Shapiro sequence, homometric to random sequences, allows one to manipulate independently two-point and four-point correlation functions, and to show their effect on the statistics of speckle patterns.

Online 27 September 2013


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Acta Cryst. (2013). A69, 549-558  [ doi:10.1107/S0108767313022514 ]

More about residual values

J. Henn and A. Schönleber

Synopsis: Predictions for residual values based on the experimental data and on knowledge of the number of model parameters used to fit the experimental data are presented. Applications to crystallographic residual values are discussed.

Online 2 October 2013


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Acta Cryst. (2013). A69, 559-569  [ doi:10.1107/S0108767313023362 ]

Direct phasing of nanocrystal diffraction

V. Elser

Synopsis: A new direct phasing method is introduced that exploits small shifts in the positions of Bragg peaks in a nanocrystal diffraction pattern.

Online 5 October 2013


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Acta Cryst. (2013). A69, 570-582  [ doi:10.1107/S0108767313024458 ]

Comparative study of X-ray charge-density data on CoSb3

M. S. Schmøkel, L. Bjerg, F. K. Larsen, J. Overgaard, S. Cenedese, M. Christensen, G. K. H. Madsen, C. Gatti, E. Nishibori, K. Sugimoto, M. Takata and B. B. Iversen

Synopsis: Experimental electron-density studies of inorganic, extended solids containing heavy elements are highly challenging. Such a study on a particularly problematic case, CoSb3, is presented and discussed.

Online 17 October 2013


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Acta Cryst. (2013). A69, 583-591  [ doi:10.1107/S0108767313021375 ]

C70, C80, C90 and carbon nanotubes by breaking of the icosahedral symmetry of C60

M. Bodner, J. Patera and M. Szajewska

Synopsis: The structure of particular hollow-cage fullerenes is described in exact coordinates, and their existence explained from a symmetry-breaking mechanism starting from the perfect icosahedral symmetry of C60. The mechanism is extended to also describe the possible construction of larger nanostructures such as carbon nanotubes, as well as sets of stereoisomers of the C60 molecule.

Online 12 September 2013


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Acta Cryst. (2013). A69, 592-602  [ doi:10.1107/S0108767313021442 ]

Platonic solids generate their four-dimensional analogues

P.-P. Dechant

Synopsis: A Clifford spinor construction shows how the Platonic solids induce their four-dimensional counterparts and determine their symmetries.

Online 12 September 2013


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Acta Cryst. (2013). A69, 603-610  [ doi:10.1107/S0108767313021740 ]

Distribution rules of systematic absences on the Conway topograph and their application to powder auto-indexing

R. Oishi-Tomiyasu

Synopsis: Distribution rules of systematic absences applicable for powder auto-indexing are provided.

Online 1 October 2013


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Acta Cryst. (2013). A69, 611-619  [ doi:10.1107/S0108767313022642 ]

Spin line groups

N. Lazic, M. Milivojevic and M. Damnjanovic

Synopsis: Spin line groups, describing magnetic symmetries of quasi-one-dimensional systems, are studied and derived for the first family line groups. Corresponding spin arrangements are discussed and illustrated by several examples.

Online 17 October 2013


book reviews


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Acta Cryst. (2013). A69, 620-621  [ doi:10.1107/S010876731301951X ]

Incommensurate Crystallography

Online 17 October 2013


international union of crystallography


 

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Acta Cryst. (2013). A69, 622-623  [ doi:10.1107/S0108767313027840 ]

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Online 17 October 2013


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