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Thermal expansivity, bulk modulus, and melting curve of H2O-ice VII to 20 GPaEquation of state properties of ice VII and fluid H2O at high pressures and temperatures have been studied experimentally from 6 to 20 GPa and 300-700 K. The techniques involve direct measurements of the unit-cell volume of the solid using synchrotron X-ray diffraction with an externally heated diamond-anvil cell. The pressure dependencies of the volume and bulk modulus of ice VII at room temperature are in good agreement with previous synchrotron X-ray studies. The thermal expansivity was determined as a function of pressure and the results fit to a newly proposed phenomenological relation and to a Mie-Gruneisen equation of state formalism. The onset of melting of ice VII was determined directly by X-ray diffraction at a series of pressures and found to be in accord with previous volumetric determinations. Thermodynamic calculations based on the new data are performed to evaluate the range of validity of previously proposed equations of state for fluid water derived from static and shock-wave compression experiments and from simulations.
Document ID
19940035665
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Fei, Yingwei
(NASA Headquarters Washington, DC United States)
Mao, Ho-Kwang
(NASA Headquarters Washington, DC United States)
Hemley, Russell J.
(Carnegie Institution of Washington Washington, United States)
Date Acquired
August 16, 2013
Publication Date
October 1, 1993
Publication Information
Publication: Journal of Chemical Physics
Volume: 99
Issue: 7
ISSN: 0021-9606
Subject Category
Thermodynamics And Statistical Physics
Accession Number
94A12320
Funding Number(s)
CONTRACT_GRANT: NSF EAR-89-20239
CONTRACT_GRANT: NSF EAR-91-18030
CONTRACT_GRANT: NAGW-1722
CONTRACT_GRANT: DE-AC02-76CH-00016
CONTRACT_GRANT: NSF EAR-91-17858
Distribution Limits
Public
Copyright
Other

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