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Book Chapter

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

By
Leonid Dubrovinsky
Leonid Dubrovinsky
Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
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Natalia Dubrovinskaia
Natalia Dubrovinskaia
Mineralphysik und Strukturforschung, Mineralogisches Institut, Universität Heidelberg, 69120 Heidelberg, Germany and Lehrstuhl für Kristallographie, Physikalisches Institut, Universität Bayreuth,D- 95440 Bayreuth, Germany, and Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
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Published:
January 01, 2007

Properties of H2O at elevated pressure and temperature are of fundamental importance in both condensed matter physics and planetary sciences. We studied behavior of H2O 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 H2O was found to be well described by the Simon equation P(GPa) = 2.2 + 1.31{[T(K)/364]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 H2O. The new material reversibly transforms to ice VII and can be obtained on cooling or compression of liquid H2O, which suggests that the high-pressure, high-temperature amorphous phase may be thermodynamically stable.

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Contents

GSA Special Papers

Advances in High-Pressure Mineralogy

Eiji Ohtani
Eiji Ohtani
Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University, Sendai 980-8578, Japan
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Geological Society of America
Volume
421
ISBN print:
9780813724218
Publication date:
January 01, 2007

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