Open AccessAn X‐ray absorption spectroscopy study of the pressure and temperature dependence of ZnBr 2 aqueous supercritical solutions
Author(s) -
Calzavara Y.,
Simonet V.,
Hazemann J. L.,
Argoud R.,
Geaymond O.,
Raoux D.
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500019051
Subject(s) - x ray absorption spectroscopy , extended x ray absorption fine structure , xanes , supercritical fluid , aqueous solution , absorption (acoustics) , absorption spectroscopy , octahedron , chemistry , spectroscopy , analytical chemistry (journal) , materials science , crystallography , crystal structure , optics , physics , organic chemistry , chromatography , quantum mechanics , composite material
X‐ray absorption spectroscopy (XAS) experiments have been performed on 1.0 and 1.6 M ZnBr 2 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.