title: Origin of the opalescence at the alpha-beta transition of quartz: role of the incommensurate phase studied by synchrotron radiation.
abstract: The origin of the light scattering observed at the alpha-beta transition of quartz is still a subject of controversy. We present structural studies performed during the coexistence of the alpha and the intermediate incommensurate (inc) phases using simultaneously synchrotron x-ray diffraction and optical techniques. The small and large angle light scatterings are due, respectively, to the orientation domains of the 3q inc phase and to the alpha phase twins revealed by diffuse x-ray scattering. In the vicinity of the interphase boundary, the two light scattering regions, both with perturbed properties, form a complex multiscale structure.
authors.affiliation: Laboratoire de Spectrométrie Physique (UMR 5588), Université Joseph Fourier, BP 87, 38402 Saint-Martin d'Hères Cedex, France. gerard.dolino@ujf-grenoble.fr
authors.forename: G
authors.initials: G
authors.lastname: Dolino
authors.forename: P
authors.initials: P
authors.lastname: Bastie
authors.forename: B
authors.initials: B
authors.lastname: Capelle
authors.forename: V
authors.initials: V
authors.lastname: Chamard
authors.forename: J
authors.initials: J
authors.lastname: Härtwig
authors.forename: P L
authors.initials: PL
authors.lastname: Guzzo