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High pressure-temperature Raman measurements of H2O melting to 22 GPa and 900 K

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Original languageEnglish
Pages (from-to)8423-8427
Number of pages5
JournalThe Journal of Chemical Physics
Volume121
Issue number17
DOIs
StatePublished - 1 Nov 2004

Abstract

The melting curve of H2O has been measured by in situ Raman spectroscopy in an externally heated diamond anvil cell up to 22 GPa and 900 K. The Raman-active OH-stretching bands and the translational modes of H2O as well as optical observations are used to directly and reliably detect melting in ice VII. The observed melting temperatures are higher than previously reported x-ray measurements and significantly lower than recent laser-heating determinations. However, our results are in accord with earlier optical determinations. The frequencies and intensities of the OH-stretching peaks change significantly across the melting line while the translational mode disappears altogether in the liquid phase. The observed OH-stretching bands of liquid water at high pressure are very similar to those obtained in shock-wave Raman measurements. (C) 2004 American Institute of Physics.

    Research areas

  • DIAMOND-ANVIL CELL, ICE-VII, ELECTRICAL-CONDUCTIVITY, THERMAL EXPANSIVITY, HYDROGEN-BONDS, BULK MODULUS, WATER, CURVE, STATE, EQUATION

ID: 11476592