Quasielastic neutron scattering with in situ humidity control: Water dynamics in uranyl fluoride

The structural phase diagram of uranyl fluoride (UO2F2), while incomplete, contains at least one anhydrous crystal structure and a second, zeolite-like structure with the formula [(UO2F2)(H2O)]7 ⋅ (H2O)4 that can be produced by adding water to the anhydrous structure. While traditional diffraction m...

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Bibliographic Details
Published in:Journal of applied physics 2016-03, Vol.119 (9)
Main Authors: Miskowiec, A., Kirkegaard, M. C., Herwig, K. W., Trowbridge, L., Mamontov, E., Anderson, B.
Format: Article
Language:English
Subjects:
Air flow
Applied physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Crystal structure
Fingerprinting
Fluorides
Humidity
MATERIALS SCIENCE
Moisture content
Moisture control
Neutron scattering
Neutrons
Phase diagrams
Phase transitions
Relative humidity
Vapor pressure
Water vapor
Zeolites
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Summary:The structural phase diagram of uranyl fluoride (UO2F2), while incomplete, contains at least one anhydrous crystal structure and a second, zeolite-like structure with the formula [(UO2F2)(H2O)]7 ⋅ (H2O)4 that can be produced by adding water to the anhydrous structure. While traditional diffraction measurements can easily differentiate these crystals, additional aqueous structures (in general of the form UO2F2 + xH2O) have been proposed as well. We present results using a novel sample environment setup to intercalate water during a quasielastic neutron scattering measurement over the course of 86 h. Our sample environment allows low-pressure (
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4943164