An X‐ray absorption spectroscopy study of the pressure and temperature dependence of ZnBr 2  aqueous supercritical solutions | Zendy

Calzavara Y. | Zendy; Simonet V. | Zendy; Hazemann J. L. | Zendy; Argoud R. | Zendy; Geaymond O. | Zendy; Raoux D. | Zendy

Open Access

An 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) - supercritical fluid , aqueous solution , x ray absorption spectroscopy , absorption (acoustics) , absorption spectroscopy , materials science , spectroscopy , raman spectroscopy , analytical chemistry (journal) , chemistry , optics , physics , chromatography , organic chemistry , 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.

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