Melting line and fluid structure factor of oxygen up to 24 GPa

Journal Article · Wed Aug 01 04:00:00 EDT 2007 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.76.054121· OSTI ID:21055099

Weck, Gunnar; Loubeyre, Paul; Eggert, Jon H; Mezouar, Mohamed; Hanfland, Michael ^[1]

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1. DIF/DPTA/SPMC, CEA, 91680 Bruyeres-le-Chatel (France)

Using synchrotron x-ray diffraction and Raman spectroscopy, we have measured the structural properties of dense fluid O{sub 2} up to 24 GPa. A quantitative evolution with pressure of the structure factor of a low-Z molecular fluid is obtained here for the first time under pressure. No evidence of molecular association is observed here in contrast to what has been observed in the cryo-O{sub 2} fluid or in the solid above 12 GPa. The melting curve, which can evidence structural changes in the fluid or the solid, has also been measured up to 750 K by direct visualization of the solid-fluid equilibrium. No unusual behavior is observed hence invalidating a previous report.

• OSTI ID: 21055099
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 5 Vol. 76; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
EQUILIBRIUM
FLUIDS
MELTING
OXYGEN
PRESSURE RANGE GIGA PA
RAMAN SPECTROSCOPY
SOLIDS
STRUCTURE FACTORS
SYNCHROTRONS
TEMPERATURE RANGE 0400-1000 K
X-RAY DIFFRACTION