Papers by Keyword: Powder Diffraction

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Authors: J.E. Parker, J. Potter, S.P. Thompson, A.R. Lennie, C.C. Tang
Abstract: Beamline I11 at Diamond began accepting users for high resolution powder diffraction experiments in Oct 2008. We present the design, key specifications, performance and the hardware of this new beamline which receives an intense and highly collimated x-ray beam generated by an in-vacuum undulator. With the simple optics (a double-crystal monochromator, harmonic rejection mirrors and slits), a high purity beam of low energy-bandpass X-rays optimised at 15 keV is delivered at the sample. The heavy duty diffraction instrument is designed to have the flexibility to house a variety of sample environments and holds two detection systems to collect high quality diffraction data, i.e. multi-analysing crystals (MAC) for high angular resolution experiments and a fast position sensitive detector (PSD) for time-resolved studies. A recent addition to the beamline capabilities is the installation of a specifically designed gas control system. This allows the in-situ dosing of a powder sample with gases such as hydrogen and carbon dioxide, at low (~10 mbar) and high pressures (<100 bar). In addition a low pressure capillary sample cell is described which is now available to users of the beamline.
Authors: H. Marciniak, Stanislaw Gierlotka, Bogdan F. Palosz
Authors: John S.O. Evans
Abstract: Topas is a powerful and flexible software suite for the analysis of powder diffraction (and other) data. In this paper we describe methods to interact with the software in efficient and customisable ways. We also provide brief details of a wiki site for sharing ideas and methods for this software ( Finally we give an overview of the potential advantages of parametric refinement methods within Topas and exemplify them with a quantitative analysis study of the phase transitions in WO3.
Authors: J. Lorimier, Frédéric Bernard, Olivier Isnard, J.C. Niepce, J.F. Bérar
Authors: T. Holz, Reiner Dietsch, H. Mai, L. Brügemann
Authors: Bogdan F. Palosz, Ewa Grzanka, Svetlana Stelmakh, Stanislaw Gierlotka, Roman Pielaszek, Ulrich Bismayer, H.-P. Weber, Th. Proffen, W. Palosz
Authors: G. Bortel, G. Oszlányi, G. Faigel, M. Tegze, T. Pusztai, S. Pekker
Authors: Andreas Leineweber
Abstract: Microstrain broadening due to composition variations in -FeN0.407 has been evaluated using different evaluation procedures ranging from pattern decomposition to whole-powder-pattern modelling. Details how to set up these procedures in the TOPAS suite of programs have been described. The different procedures yield essentially the same results, but they have their advantages and disadvantages, which are discussed.
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