Journal article
High-Pressure-Induced Phase Transitions in Pentaerythritol: X-ray and Raman Studies
The journal of physical chemistry. B, Vol.109(47), pp.22581-22587
12/01/2005
Handle:
https://hdl.handle.net/2376/107742
PMID: 16853940
Abstract
The high-pressure response of pentaerythritol crystals has been examined to 10 GPa in diamond-anvil cells using angle-dispersive synchrotron X-ray diffraction and Raman spectroscopy. The results reveal two first-order phase transitions: one at 4.8 GPa from phase I, tetragonal I4̄( ), to phase II, orthorhombic Pnn2( ), with a small ∼0.5% volume change, and the other at 7.2 GPa to phase III with an unknown crystal structure. We found that phase I exhibits a large crystallographic anisotropy which rapidly decreases with increasing pressure: the ratio of linear compressibilities between two primary crystal axes decreases from βo = 8.1 at 1 atm to βP = 2.6 at 4 GPa. We suggest that this apparent decrease in crystal anisotropy is due to the disruption of hydrogen bonding in the (001) plane of phase I and eventually leads to an orthorhombic distortion from a quadrilateral network structure in phase I to a quasi one-dimensional structure in phase II. The crystal structure of phase III exhibits a disordered character, and it is likely a conformational variant of phase II.
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Details
- Title
- High-Pressure-Induced Phase Transitions in Pentaerythritol: X-ray and Raman Studies
- Creators
- Zbigniew A DregerYogendra M GuptaChoong-Shik YooHyunchae Cynn
- Publication Details
- The journal of physical chemistry. B, Vol.109(47), pp.22581-22587
- Academic Unit
- Physics and Astronomy, Department of; Institute for Shock Physics
- Publisher
- American Chemical Society
- Identifiers
- 99900546767401842
- Language
- English
- Resource Type
- Journal article