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. Nanostructuration de la muscovite : Une étude par diffraction d'électrons lents en mode oscillant.

Abstract : The air-cleaved mica muscovite surface has been studied by low-energy electron diffraction in oscillating mode. This new method for structural analysis, using a standard "display-type" system, has proved to be of great sensitivity. Moreover, the oscillating mode supplies full frame images which is not the case of today?s high-resolution diffractometers. This property gives the opportunity to capture images which are time-correlated to an external excitation. A new range of experiments are thus possible. One example is to study the thermodynamical response of surfaces near phase transition points. The study of the mica muscovite surface with low-energy electron diffraction in oscillating mode has given evidence of its nanostructured state. Our interpretation is that the surface self-organises during cleavage and forms islands in which potassium atoms occupy all the regular sites of the crystal. These islands are either of a constant size or regularly separated. In between islands, the potassium, in much lower density, forms an amorphous layer.
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Submitted on : Wednesday, April 16, 2003 - 4:27:51 PM
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Sébastien Dorel. . Nanostructuration de la muscovite : Une étude par diffraction d'électrons lents en mode oscillant.. Matière Condensée [cond-mat]. Université Paris Sud - Paris XI, 2000. Français. ⟨tel-00002738⟩

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