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...A focusing Laue diffractometer for the investigation of bulk crystals- June 21, 2008 A focusing Laue diffractometer for high-energy X-rays of up to 300keV in a laboratory environment is presented. The long attenuation length for X-ray energies above 50keV allows for the non-destructive investigation of structural issues and bulk properties of single crystals. Furthermore, massive sample environments such as high-temperature furnaces can be used more easily. With an area detector, anisotropic mosaicities or crystallite structure become visible without any rocking movement of the.http://scripts.iucr.org/cgi-bin/paper?ks5175 Maximum disorientation angles between crystals of any point groups and their corresponding rotation axes- June 21, 2008 The symmetry-reduced misorientation, i.e. disorientation, between two crystals is represented in the angleaxis format, and the maximum disorientation angle between any two lattices of the 32 point groups is obtained by constructing the fundamental zone of the associated misorientation space (i.e. RodriguesFrank space) using quaternion algebra. A computer program based on vertex enumeration was designed to automatically calculate the vertices of these fundamental zones and to seek the maximum...http://scripts.iucr.org/cgi-bin/paper?cg5082 Rotation axis analysis of deformed crystals by X-rays and electrons- June 21, 2008 X-ray and electron backscatter diffraction (EBSD) have been applied to investigate misorientation distributions in copper single crystals plastically deformed in single and multiple slip. The misorientation distributions are represented by rocking curves' about specific rotation axes. Very good agreement for the rocking curves established by the two methods was obtained, despite the large difference between their resolution depths. Following this agreement, a new rotation axis imaging scheme,...http://scripts.iucr.org/cgi-bin/paper?ks5176 Removing bias from solvent atoms in electron density maps- June 21, 2008 Atomic structures of proteins determined via protein crystallography contain numerous solvent atoms. The experimental data for the determination of a water molecule's O-atom position is often a small contained blob of unidentified electron density. Unfortunately, the nature of crystallographic refinement lets poorly placed solvent atoms bias the future refined positions of all atoms in the crystal structure. This research article presents the technique of omit-maps applied to remove the bias...http://scripts.iucr.org/cgi-bin/paper?he5403 Branching and twinning in -cristobalite dendrites: an electron backscatter diffraction study- June 14, 2008 In this paper, the electron backscatter diffraction (EBSD) technique is used to determine the orientations of -cristobalite dendrites. The two branches of the cross-shaped -cristobalite dendrite extend along the crystallographic directions 100 and 010, but no branches develop along 001. A new kind of twinning relationship is found between two -cristobalite dendrites. The twin axes are 110, 111 and bar 1bar 11, and the twin planes are (111) and (bar 1bar 11). It is shown that crystallographic...http://scripts.iucr.org/cgi-bin/paper?cg5077 X-ray diffraction by polycrystalline materials. By Ren Guinebretire. Pp. 351. London: ISTE, 2007. Price (hardcover) EUR 124.83. ISBN 978-1905209217.- June 14, 2008http://scripts.iucr.org/cgi-bin/paper?pf0067 Fast and easy Bragg reflex search for BergBarrett topography of misoriented crystals- June 14, 2008 A fast search method for X-ray Bragg reflexes of misoriented crystals is presented. The method is also applicable to determine the accuracy of the crystal orientation. This technique is demonstrated by means of a simple setup for BergBarrett X-ray topography, consisting of a rotating sample holder on a two-circle diffractometer. The imaged area of the topograms is about 1cm2, and the quality is comparable to the topograms taken by white-beam synchrotron X-ray topography.http://scripts.iucr.org/cgi-bin/paper?dd5038 Point-focusing monochromator crystal realized by hot plastic deformation of a Ge wafer- June 14, 2008 Pre-polished Ge(111) single-crystal wafers were deformed just below the melting temperature to prepare point-focusing Johansson monochromator crystals. The (111) lattice plane had curvature 2R in the focusing plane and R perpendicular to it, with a hemispherical inner surface with a radius of R = 600mm. By using Cu K radiation, the diverging X-ray beam was focused onto a small spot.http://scripts.iucr.org/cgi-bin/paper?ks5182 Intergrowth of several solid phases from the YNiBC system in a large YNi2B2C crystal- June 14, 2008 A YNi2B2C single crystal containing traces of foreign phases was inspected by means of neutron and X-ray diffraction as well as scanning electron microscopy and X-ray spectroscopy methods. The diffraction patterns obtained from the experiments look similar to those expected for a superstructure. Nevertheless, they can be interpreted as crystallographically oriented precipitations of YB2C2 and Ni2B within the YNi2B2C crystal, formed during the cooling process. The orientation relation between...http://scripts.iucr.org/cgi-bin/paper?ks5170 Anomalous small-angle scattering from nanoquasicrystalline precipitates in Zr80Pt20 ribbons- June 14, 2008 Anomalous small-angle X-ray scattering (ASAXS) profiles of Zr80Pt20 ribbons have been measured at the Zr K absorption edge. By annealing the melt-spun ribbons at 800K, well defined SAXS patterns from nanoquasicrystals were observed, although the compositions of the quasicrystals (QC) and the amorphous matrix have previously been reported to be the same. The SAXS intensities were found to show a small anomalous effect at the Zr K edge. Contrast analysis suggested that the origin of the...http://scripts.iucr.org/cgi-bin/paper?ks5183 |