Journal article
Pressure-induced phase and chemical transformations of lithium peroxide (Li2O2)
The Journal of chemical physics, Vol.145(8), pp.084701-084701
08/28/2016
Handle:
https://hdl.handle.net/2376/109167
PMID: 27586935
Abstract
We present the pressure-induced phase/chemical changes of lithium peroxide (Li2O2) to 63 GPa using diamond anvil cells, confocal micro-Raman spectroscopy, and synchrotron x-ray diffraction. The Raman data show the emergence of the major vibrational peaks associated with O2 above 30 GPa, indicating the subsequent pressure-induced reversible chemical decomposition (disassociation) in dense Li2O2. The x-ray diffraction data of Li2O2, on the other hand, show no dramatic structural change but remain well within a P63/mmc structure to 63 GPa. Nevertheless, the Rietveld refinement indicates a subtle change in the structural order parameter z of the oxygen position O (13, 23, z) at around 35 GPa, which can be considered as a second-order, isostructural phase transition. The nearest oxygen-oxygen distance collapses from 1.56 Å at ambient condition to 1.48 Å at 63 GPa, resulting in a more ionic character of this layered crystal lattice, 3Li(+)+(LiO2)3 (3-). This structural change in turn advocates that Li2O2 decomposes to 2Li and O2, further augmented by the densification in specific molar volumes.
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Details
- Title
- Pressure-induced phase and chemical transformations of lithium peroxide (Li2O2)
- Creators
- Mihindra Dunuwille - Department of Chemistry and Institute for Shock Physics, Washington State University, Pullman, Washington 99164, USAMinseob Kim - Department of Chemistry and Institute for Shock Physics, Washington State University, Pullman, Washington 99164, USAChoong-Shik Yoo - Department of Chemistry and Institute for Shock Physics, Washington State University, Pullman, Washington 99164, USA
- Publication Details
- The Journal of chemical physics, Vol.145(8), pp.084701-084701
- Academic Unit
- Institute for Shock Physics
- Publisher
- United States
- Identifiers
- 99900547487001842
- Language
- English
- Resource Type
- Journal article