Document Detail


Polymorphism of dense, hot oxygen.
MedLine Citation:
PMID:  21895204     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The phase diagram and polymorphism of oxygen at high pressures and temperatures are of great interest to condensed matter and earth science. X-ray diffraction and Raman spectroscopy of oxygen using laser and resistively heated diamond anvil cells reveal that the molecular high-pressure phase ɛ-O(2), which consists of (O(2))(4) clusters, reversibly transforms in the pressure range of 44 to 90 GPa and temperatures near 1000 K to a new phase with higher symmetry. The data suggest that this new phase (η(')) is isostructural to a phase η reported previously at lower pressures and temperatures, but differs from it in the P-T range of stability and type of intermolecular association. The melting curve increases monotonically up to the maximum pressures studied (∼60 GPa). The structure factor of the fluid measured as a function of pressure to 58 GPa shows continuous changes toward molecular dissociation.
Authors:
Alexander F Goncharov; N Subramanian; T R Ravindran; Maddury Somayazulu; Vitali B Prakapenka; Russell J Hemley
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of chemical physics     Volume:  135     ISSN:  1089-7690     ISO Abbreviation:  J Chem Phys     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-09-07     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375360     Medline TA:  J Chem Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  084512     Citation Subset:  IM    
Affiliation:
Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USAMaterials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, IndiaCenter for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA.
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