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New phase diagram of oxygen at high pressures and temperatures

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Original languageEnglish
Article number265701
Number of pages4
JournalPhysical Review Letters
Volume93
Issue number26
DOIs
Publication statusPublished - 31 Dec 2004

Abstract

In situ high P-T Raman measurements and optical observations of solid and fluid oxygen up to 1250 K between 8 and 25 GPa reveal the existence of a new molecular phase eta and strikingly unusual behavior of the melting curve. Three triple points were also identified in the P-T domain of the new phase. The data give a direct measure of the melting curve that greatly extends previous optical investigations. We find the melting temperature is significantly higher than that indicated by the existing phase diagram (e.g., 400 K higher at 25 GPa). Raman measurements in low and high frequency regions reveal the extent of orientational order disorder and persistence of strong intermolecular interactions in the high P-T phases.

    Research areas

  • SOLID OXYGEN, EPSILON-PHASE, DIFFRACTION, TRANSITION, MOLECULES, 298-K, GPA

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