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A new modeling of the X-ray diffraction by disordered lamellar structures, such as phyllosilicates.

Abstract : The “classical” modeling of powder X-ray diffraction (XRD) patterns of lamellar structures, such as phyllosilicates, assumes that the samples are composed of “crystals” having various thickness and well-defined translations between layers. This model is able to describe the high-angle domain of XRD patterns but sometimes fails in the low-angle region. The new model proposed here considers the samples to be composed of “particles” that have larger sizes than crystals and contain defects such as cracks, inner-porosity, bent layers, edge dislocations, etc. These defects induce variations in the d-spacings, introduced in the calculation by distributions of the d-spacings. For phyllosilicates, this model is consistent not only with XRD, but also with small-angle X-ray scattering (SAXS) data, transmission electron microscopy (TEM) results, and high-resolution transmission electron microscopy (HRTEM) observations.
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Submitted on : Wednesday, May 31, 2006 - 9:47:19 AM
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Alain Plançon. A new modeling of the X-ray diffraction by disordered lamellar structures, such as phyllosilicates.. American Mineralogist, Mineralogical Society of America, 2002, 87, pp.(11-12) 1672 1677. ⟨hal-00071060⟩

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