(IUCr) Contents for Acta Crystallographica Section A Vol. 62 Part 1 (January 2006)

Foundations of Crystallography

Volume 62, Part 1 (January 2006)

Cover illustration: Determination of a one-dimensional structure by the charge flipping algorithm. Bottom curves: grey is the initial electron density obtained with a random choice of structure-factor phases; white is the result of charge flipping, i.e. the sign of the density below a threshold is reversed. Top curves: electron density after convergence (blue) and its flipped counterpart (red). Only the three atomic regions correspond to the true structure, small oscillations do not. See Oszlányi & Süto [Acta Cryst. (2004), A60, 134-141; (2005), A61, 147-152].

research papers

Acta Cryst. (2006). A62, 1-10 [ doi:10.1107/S0108767305036111 ]

X-ray diffraction by a crystal in a permanent external electric field: electric-field-induced structural response in -GaPO₄

S. Gorfman, V. Tsirelson, A. Pucher, W. Morgenroth and U. Pietsch

Synopsis: Electric-field-induced pseudoatomic displacements in [alpha] -GaPO₄ are studied by means of an X-ray diffraction experiment. The site-selective analysis shows that the PO₄ tetrahedra are more strongly distorted compared to those of GaO₄ owing to the higher pseudoatomic charge of phosphorus.

Online 22 December 2005

Acta Cryst. (2006). A62, 11-20 [ doi:10.1107/S0108767305037657 ]

Reciprocal-space mapping of epitaxic thin films with crystallite size and shape polydispersity

A. Boulle, F. Conchon and R. Guinebretière

Synopsis: A development is presented that allows the simulation of reciprocal-space maps of epitaxic thin films exhibiting fluctuations in the size and shape of the crystalline domains over which diffraction is coherent. In all cases considered, the computation of the reciprocal-space map only requires a two-dimensional Fourier integral and the integrand has a simple analytical expression.

Online 22 December 2005

Acta Cryst. (2006). A62, 21-40 [ doi:10.1107/S010876730503686X ]

Groupoid of orientational variants

C. Cayron

Synopsis: The orientational variants generated by twinning, precipitation or phase transition are algebraically described by a groupoid theory.

Online 22 December 2005

Acta Crystallographica Section A

Foundations of Crystallography

Volume 62, Part 1 (January 2006)

research papers

X-ray diffraction by a crystal in a permanent external electric field: electric-field-induced structural response in -GaPO₄

S. Gorfman, V. Tsirelson, A. Pucher, W. Morgenroth and U. Pietsch

Reciprocal-space mapping of epitaxic thin films with crystallite size and shape polydispersity

A. Boulle, F. Conchon and R. Guinebretière

Groupoid of orientational variants

C. Cayron

international union of crystallography

Notes for authors 2006

Acta Crystallographica Section A

Foundations of Crystallography

Volume 62, Part 1 (January 2006)

research papers

X-ray diffraction by a crystal in a permanent external electric field: electric-field-induced structural response in -GaPO4

S. Gorfman, V. Tsirelson, A. Pucher, W. Morgenroth and U. Pietsch

Reciprocal-space mapping of epitaxic thin films with crystallite size and shape polydispersity

A. Boulle, F. Conchon and R. Guinebretière

Groupoid of orientational variants

C. Cayron

international union of crystallography

Notes for authors 2006

X-ray diffraction by a crystal in a permanent external electric field: electric-field-induced structural response in -GaPO₄