title: A time resolved high energy X-ray diffraction study of cooling liquid SiO2.
abstract: The evolution of the X-ray structure factor and corresponding pair distribution function of SiO2 has been measured upon cooling from the melt using high energy X-ray diffraction combined with aerodynamic levitation. Small changes in the position of the average Si-O bond distance and peak width are found to occur at ~1500(100) K in the region of the calorimetric glass transition temperature, T(g) and the observed density minima. At higher temperatures deviations from linear behavior are seen in the first sharp diffraction peak width, height and area at around 1750(50) K, which coincides with the reported density maximum around 1.2T(g).
authors.affiliation: X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA.
authors.forename: L B
authors.initials: LB
authors.lastname: Skinner
authors.forename: C J
authors.initials: CJ
authors.lastname: Benmore
authors.forename: J K R
authors.initials: JK
authors.lastname: Weber
authors.forename: M C
authors.initials: MC
authors.lastname: Wilding
authors.forename: S K
authors.initials: SK
authors.lastname: Tumber
authors.forename: J B
authors.initials: JB
authors.lastname: Parise
mesh_terms: D003080:Cold Temperature; D012822:Silicon Dioxide / Q000737:chemistry*; D013997:Time Factors; D014961:X-Ray Diffraction
chemical_list: D012822:Silicon Dioxide