[IUCr 2014 Congress]

Acta Crystallographica Section A

Foundations of Crystallography

Volume 69, Part 5 (September 2013)



[Issue Author Index][Volume Author Index]
[Cover illustration] Cover illustration: Influence of Bragg diffraction on the phase shift of neutrons passing through a perfect silicon crystal. Depending on the crystal orientation, various Bragg conditions can be fulfilled resulting in an increase (red) or decrease (blue) of the ordinary refractive phase shift. [Lemmel (2013). Acta Cryst. A69, 459-474].

research papers


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Acta Cryst. (2013). A69, 459-474  [ doi:10.1107/S0108767313014293 ]

Influence of Bragg diffraction on perfect crystal neutron phase shifters and the exact solution of the two-beam case in the dynamical diffraction theory

H. Lemmel

Synopsis: The theory and measurement of the neutron phase shift, index of refraction or coherent scattering length of perfect crystal samples in a neutron interferometer are described. Residual phase corrections far off-Bragg are identified as local field corrections.

Online 23 July 2013


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Acta Cryst. (2013). A69, 475-482  [ doi:10.1107/S0108767313018138 ]

Diffuse scattering intensity near the Bragg reflection in a (para)magnetic bulk face-centred cubic Ni3Fe-type permalloy

S. M. Bokoch, V. A. Tatarenko and I. V. Vernyhora

Synopsis: Within the scope of the classical theoretical models, the diffuse scattering intensities (caused by the short-range atomic order) near the Bragg reflection in a (para)magnetic bulk face-centred cubic Ni3Fe-type permalloy are investigated, taking into account the long-range magnetic order and `strain-induced' effects. The analytic azimuthal and nonanalytic `radial' behaviours of the diffuse intensities as well as the `mixing' energy Fourier components are analysed in detail.

Online 23 July 2013


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Acta Cryst. (2013). A69, 483-489  [ doi:10.1107/S0108767313018370 ]

Minimal nets and minimal minimal surfaces

L. de Campo, O. Delgado-Friedrichs, S. T. Hyde and M. O'Keeffe

Synopsis: It is shown that the 15 minimal nets can serve as the labyrinth graph of one or other of the five known minimal surfaces of genus 3 and that the enumeration of such surfaces is likely to be complete.

Online 26 July 2013


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Acta Cryst. (2013). A69, 490-497  [ doi:10.1107/S0108767313019612 ]

Semi-transparent central stop in high-resolution X-ray ptychography using Kirkpatrick-Baez focusing

R. N. Wilke, M. Vassholz and T. Salditt

Synopsis: A semi-transparent central stop has been used for ptychographic coherent diffractive imaging to increase the effective dynamic range in the recording of the far-field diffraction patterns. In this way, the high flux density provided by nano-focusing Kirkpatrick-Baez mirrors can be fully exploited for high resolution and quantitative phase reconstructions.

Online 14 August 2013


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Acta Cryst. (2013). A69, 498-509  [ doi:10.1107/S0108767313019016 ]

One-step model of the face-centred-cubic to body-centred-cubic martensitic transformation

C. Cayron

Synopsis: A model of the face-centred-cubic to body-centred-cubic martensitic transformation based on Pitsch distortion explains the continuum of martensite variant orientations observed in electron backscatter diffraction.

Online 15 August 2013


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Acta Cryst. (2013). A69, 510-516  [ doi:10.1107/S0108767313015572 ]

On the enumeration of the combinatorial types of primitive parallelohedra in Ed, 2 [less-than or equal to] d [less-than or equal to] 6

I. A. Baburin and P. Engel

Synopsis: The cone of positive-definite quadratic forms is subdivided into subcones of combinatorial types of primitive parallelohedra in Ed, 2 [less-than or equal to] d [less-than or equal to] 6. An efficient algorithm is described.

Online 26 July 2013


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Acta Cryst. (2013). A69, 517-527  [ doi:10.1107/S0108767313015249 ]

Iterative projection algorithms in protein crystallography. I. Theory

R. P. Millane and V. L. Lo

Synopsis: A general class of iterative projection algorithms is proposed as a tool for phase determination in protein crystallography. The main iterative projection algorithms are described as well as their potential application to protein crystallography.

Online 8 August 2013


obituaries


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Acta Cryst. (2013). A69, 528-529  [ doi:10.1107/S0108767313017650 ]

Steve Wilkins (1946-2013)

J. Varghese

Synopsis: Obituary for Steve Wilkins.

Online 14 August 2013


book reviews


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Acta Cryst. (2013). A69, 530-532  [ doi:10.1107/S0108767313018825 ]

Geometry of Crystallographic Groups

Online 23 July 2013


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