Journal of Applied CrystallographyJournal of Applied Crystallography covers a wide range of crystallographic topics from the viewpoints of both techniques and theory. The journal presents papers on the application of crystallographic techniques and on the related apparatus and computer software. For many years, the Journal of Applied Crystallography has been the main vehicle for the publication of small-angle scattering papers and powder diffraction techniques. The journal is the primary place where crystallographic computer...Synchrotron X-ray powder diffraction and extended X-ray absorption fine structure spectroscopy studies on nanocrystalline ZrO2CaO solid solutions- June 14, 2008 The crystal structure and the local atomic order of a series of nanocrystalline ZrO2CaO solid solutions with varying CaO content were studied by synchrotron radiation X-ray powder diffraction and extended X-ray absorption fine structure (EXAFS) spectroscopy. These samples were synthesized by a pH-controlled nitrateglycine gel-combustion process. For CaO contents up to 8mol%, the t form of the tetragonal phase (ca > 1) was identified, whereas for 10 and 12mol% CaO, the t form (ca = 1; oxygen..http://scripts.iucr.org/cgi-bin/paper?ks5166 Critical opalescence points to thermodynamic instability: relevance to small-angle X-ray scattering of resorcinolformaldehyde gel formation at low pH- June 6, 2008 During the formation at low pH of resorcinolformaldehyde gels with a structure in the micrometre range, small-angle X-ray scattering exhibits a non-monotonic intensity variation as a function of reaction time. The data are analyzed in terms of scattering by statistical fluctuations of polymer concentration, the amplitude of which is maximal close to the critical point for phase separation between polymer and solvent. The data do not carry any morphological information, but they unambiguously...http://scripts.iucr.org/cgi-bin/paper?ce5031 VCIF2: extended CIF validation software- June 6, 2008 Recent revisions to the CIF standard, the growing number of dictionaries and the critical role played by CIF in the IUCr publication process led the IUCr to fund a two-year project to upgrade portions of the existing CIF software base to support longer lines and more rigorous validation of CIFs against multiple layered dictionaries. A database-based approach to validation to ensure compliance with data-range and enumeration specifications, to ensure compliance with parentchild relationships,...http://scripts.iucr.org/cgi-bin/paper?he5407 A method for merging of ultra-small-angle X-ray scattering and smeared small-angle X-ray scattering patterns of fibers- June 6, 2008 A method for collimation correction and combination of anisotropic scattering patterns recorded in tandem experiments is proposed. It includes both an advanced two-dimensional extrapolation procedure for the center of the pattern and (compared with the blind deconvolution' method) a more justified procedure for desmearing from an unknown broad primary beam profile. This semi-blind deconvolution rests on the availability of unsmeared data in a region of the smeared image. Materials exhibiting...http://scripts.iucr.org/cgi-bin/paper?ce5033 Simultaneous reverse Monte Carlo refinements of local structures in perovskite solid solutions using EXAFS and the total scattering pair-distribution- June 6, 2008 Reverse Monte Carlo (RMC) refinements using a combined real-space fit of the neutronX-ray total scattering pair-distribution function (PDF) and the extended X-ray absorption fine structure (EXAFS) were developed and implemented as an extension to the public domain computer software RMCProfile. The effectiveness of combined PDFEXAFS RMC refinements was tested using perovskite Ca(Zr,Ti)O3 solid solutions. The analyses revealed that combining two types of data yields correct distributions of the...http://scripts.iucr.org/cgi-bin/paper?ko5058 Reciprocal-space imaging of a real quasicrystal. A feasibility study with PILATUS 6M- June 6, 2008 How many of the theoretically densely distributed Bragg reflections of a quasicrystal can be observed employing an area detector and synchrotron radiation How does the reflection density of a real quasicrystal change as a function of exposure time, and what is the minimum distance between reflections What does the distribution of diffuse scattering look like To answer these questions, the Bragg reflection density of a perfect icosahedral quasicrystal with composition Al64Cu23Fe13 was measured...http://scripts.iucr.org/cgi-bin/paper?ce5041 A high-resolution small-angle light scattering instrument for soft matter studies- June 6, 2008 A small-angle light scattering (SALS) instrument with a high resolution at low angles and a high signal-to-noise ratio has been developed. Both a wide dynamic range and a wide scattering vector range are achieved using a two-dimensional array of complementary metal oxide semiconductor image sensors. These instrument characteristics have enabled us to obtain high-quality light scattering data from soft matter systems. This setup is especially well suited to studies of systems with a weak...http://scripts.iucr.org/cgi-bin/paper?aj5102 Absorption correction based on a three-dimensional model reconstruction from visual images- June 6, 2008 The results are presented of a feasibility study for the application of absorption corrections to macromolecular crystallographic X-ray diffraction data using a three-dimensional crystal model generated photographically. The model allows path lengths through the crystal, the solvent and the crystal mount system to be determined. The approach has been tested on the macromolecular crystallography beamline ID23-1 at the ESRF in Grenoble using a model insulin system with the standard mini...http://scripts.iucr.org/cgi-bin/paper?dd5039 |