title: An X-ray absorption spectroscopy study of the pressure and temperature dependence of ZnBr2 aqueous supercritical solutions.
abstract: X-ray absorption spectroscopy (XAS) experiments have been performed on 1.0 and 1.6 M ZnBr2 aqueous solutions under ambient to supercritical conditions. Both the X-ray absorption near-edge structure (XANES) and the extended X-ray absorption fine structure (EXAFS) show striking evolutions, which indicate major structural changes, with a strong reduction in hydration and the increasing formation of ZnBr pairs. A quantitative analysis of the evolution of the Zn environment is presented that supports the existence of a transition from an octahedral to a tetrahedral environment.
authors.affiliation: Laboratoire de Cristallographie, CNRS and Université J. Fourier, Grenoble, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Calzavara
authors.forename: V
authors.initials: V
authors.lastname: Simonet
authors.forename: J L
authors.initials: JL
authors.lastname: Hazemann
authors.forename: R
authors.initials: R
authors.lastname: Argoud
authors.forename: O
authors.initials: O
authors.lastname: Geaymond
authors.forename: D
authors.initials: D
authors.lastname: Raoux