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

Alain Plançon (1)

1 ISTO - Institut des Sciences de la Terre d'Orléans

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.

Domaines: Minéralogie

Alain Plançon. A new modeling of the X-ray diffraction by disordered lamellar structures, such as phyllosilicates.. The American Mineralogist, 2002, 87, pp.(11-12) 1672 1677. ⟨hal-00071060⟩