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Melting of ice VII and new high-pressure, high-temperature amorphous ice

Leonid S. Dubrovinsky and Natalia Dubrovinskaia
Melting of ice VII and new high-pressure, high-temperature amorphous ice (in Advances in high-pressure mineralogy, Eiji Ohtani (editor))
Special Paper - Geological Society of America (2007) 421: 105-113


Properties of H (sub 2) O at elevated pressure and temperature are of fundamental importance in both condensed matter physics and planetary sciences. We studied behavior of H (sub 2) O in externally heated diamond anvil cells (DACs) at pressures up to 50 GPa and temperatures to 1150 K by combining visual observations, Raman spectroscopy, and X-ray powder diffraction. The melting curve of H (sub 2) O was found to be well described by the Simon equation P(GPa) = 2.2+1.31{[T(K)/364] (super 3.3) -1}. Above 30 GPa and 950 K, using visual observations and Raman spectroscopy, we found an X-ray amorphous phase clearly distinct from liquid H (sub 2) O. The new material reversibly transforms to ice VII and can be obtained on cooling or compression of liquid H (sub 2) O, which suggests that the high-pressure, high-temperature amorphous phase may be thermodynamically stable.

ISSN: 0072-1077
EISSN: 2331-219X
Serial Title: Special Paper - Geological Society of America
Serial Volume: 421
Title: Melting of ice VII and new high-pressure, high-temperature amorphous ice
Title: Advances in high-pressure mineralogy
Author(s): Dubrovinsky, Leonid S.Dubrovinskaia, Natalia
Author(s): Ohtani, Eijieditor
Affiliation: Bayerisches Geoinstitut, Universitaet Bayreuth, Bayreuth, Federal Republic of Germany
Affiliation: Tohoku University, Institue of Mineralogy, Petrology, and Economic Geology, Sendai, Japan
Pages: 105-113
Published: 2007
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 978-0-8137-2421-8
References: 24
Accession Number: 2008-044748
Categories: General geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Universitaet Heidelberg, DEU, Federal Republic of Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200813
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