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    Whole-pattern profile fitting of powder diffraction data collected in parallel-beam flat-plate asymmetric reflection geometry

    227936.pdf (375.0Kb)
    Access Status
    Open access
    Authors
    Rowles, Matthew
    Madsen, I.
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Rowles, M. and Madsen, I. 2010. Whole-pattern profile fitting of powder diffraction data collected in parallel-beam flat-plate asymmetric reflection geometry. Journal of Applied Crystallography. 43 (3): pp. 632-634.
    Source Title
    Journal of Applied Crystallography
    DOI
    10.1107/S0021889810007673
    ISSN
    0021-8898
    URI
    http://hdl.handle.net/20.500.11937/36885
    Collection
    • Curtin Research Publications
    Abstract

    Abstract: A simple, physically based model that allows the whole-pattern profile fitting of diffraction data collected in parallel-beam flat-plate asymmetric reflection geometry is presented. In this arrangement, there is a fixed angle between the incident beam and the sample, resulting in a fixed-length beam footprint. The use of a wide-angle detector for the simultaneous detection of the data precludes the use of any diffracted beam optics. Therefore, the observed peak widths are a function of the length of the beam footprint on the sample. The model uses up to three refinable parameters, depending on the intensity profile of the beam, to calculate the effect of diffraction angle on the width of all diffracted peaks. The use of this model reduces the total number of parameters required to fit the observed peak widths and shapes, hence leading to increased stability in the profile analysis. Implementations of the model are provided for both fundamental parameters and empirical approaches.

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