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A. Authier (2001)
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The statistical kinematical theory of X-ray diffraction as applied to reciprocal-space mappingActa crystallographica. Section A, Foundations of crystallography, 56 (Pt 6)
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A development is presented that allows the simulation of reciprocal‐space maps (RSMs) of epitaxic thin films exhibiting fluctuations in the size and shape of the crystalline domains over which diffraction is coherent (crystallites). Three different crystallite shapes are studied, namely parallelepipeds, trigonal prisms and hexagonal prisms. For each shape, two cases are considered. Firstly, the overall size is allowed to vary but with a fixed thickness/width ratio. Secondly, the thickness and width are allowed to vary independently. The calculations are performed assuming three different size probability density functions: the normal distribution, the lognormal distribution and a general histogram distribution. In all cases considered, the computation of the RSM only requires a two‐dimensional Fourier integral and the integrand has a simple analytical expression, i.e. there is no significant increase in computing times by taking size and shape fluctuations into account. The approach presented is compatible with most lattice disorder models (dislocations, inclusions, mosaicity, …) and allows a straightforward account of the instrumental resolution. The applicability of the model is illustrated with the case of an yttria‐stabilized zirconia film grown on sapphire.
Acta Crystallographica Section A Foundations of Crystallography – Wiley
Published: Jan 1, 2006
Keywords: ; ;
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