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New modeling of X-ray diffraction by disordered lamellar structures, such as phyllosilicates
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Alain Plançon
Published/Copyright:
March 28, 2015
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.
Received: 2001-10-23
Accepted: 2001-2-28
Published Online: 2015-3-28
Published in Print: 2002-11-1
© 2015 by Walter de Gruyter Berlin/Boston
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- Characteristics of mixed-layer smectite/illite density separates during burial diagenesis
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