Journal article
Phase transition and chemical decomposition of hydrogen peroxide and its water mixtures under high pressures
The Journal of chemical physics, Vol.132(21), pp.214501-214501
06/07/2010
Handle:
https://hdl.handle.net/2376/109925
PMID: 20528025
Abstract
We have studied the pressure-induced phase transition and chemical decomposition of hydrogen peroxide and its mixtures with water to 50 GPa, using confocal micro-Raman and synchrotron x-ray diffractions. The x-ray results indicate that pure hydrogen peroxide crystallizes into a tetragonal structure (P4(1)2(1)2), the same structure previously found in 82.7% H(2)O(2) at high pressures and in pure H(2)O(2) at low temperatures. The tetragonal phase (H(2)O(2)-I) is stable to 15 GPa, above which transforms into an orthorhombic structure (H(2)O(2)-II) over a relatively large pressure range between 13 and 18 GPa. Inferring from the splitting of the nu(s)(O-O) stretching mode, the phase I-to-II transition pressure decreases in diluted H(2)O(2) to around 7 GPa for the 41.7% H(2)O(2) and 3 GPa for the 9.5%. Above 18 GPa H(2)O(2)-II gradually decomposes to a mixture of H(2)O and O(2), which completes at around 40 GPa for pure and 45 GPa for the 9.5% H(2)O(2). Upon pressure unloading, H(2)O(2) also decomposes to H(2)O and O(2) mixtures across the melts, occurring at 2.5 GPa for pure and 1.5 GPa for the 9.5% mixture. At H(2)O(2) concentrations below 20%, decomposed mixtures form oxygen hydrate clathrates at around 0.8 GPa--just after H(2)O melts. The compression data of pure H(2)O(2) and the stability data of the mixtures seem to indicate that the high-pressure decomposition is likely due to the pressure-induced densification, whereas the low-pressure decomposition is related to the heterogeneous nucleation process associated with H(2)O(2) melting.
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Details
- Title
- Phase transition and chemical decomposition of hydrogen peroxide and its water mixtures under high pressures
- Creators
- Jing-Yin Chen - Department of Chemistry and Institute for Shock Physics, Washington State University, Pullman, Washington 99164-2816, USA. jychen@wsu.eduMinseob KimChoong-Shik YooDana M DattelbaumStephen Sheffield
- Publication Details
- The Journal of chemical physics, Vol.132(21), pp.214501-214501
- Academic Unit
- Institute for Shock Physics
- Publisher
- United States
- Identifiers
- 99900547491901842
- Language
- English
- Resource Type
- Journal article