Nature of the first-order phase transition in fluid phosphorus at high temperature and pressure

An in situ x-ray diffraction experiment has been performed on phosphorus to characterize the liquid-liquid transition which occurs at high temperature and pressure. The transition line has been measured over an extended temperature range up to 2200 degrees C at 0.3 GPa. From the shape of this line,...

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Bibliographic Details
Published inPhysical review letters Vol. 90; no. 25 Pt 1; p. 255701
Main Authors Monaco, G, Falconi, S, Crichton, W A, Mezouar, M
Format Journal Article
LanguageEnglish
Published United States 27.06.2003
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Summary:An in situ x-ray diffraction experiment has been performed on phosphorus to characterize the liquid-liquid transition which occurs at high temperature and pressure. The transition line has been measured over an extended temperature range up to 2200 degrees C at 0.3 GPa. From the shape of this line, a thermodynamic characterization of the transition is obtained in terms of latent heat and internal energy change. Moreover, the addition of the high-pressure high-temperature data to the known phase diagram of phosphorus allows us to conclude that this is a first-order transition between a dense molecular fluid and a polymeric liquid.
ISSN:0031-9007
DOI:10.1103/physrevlett.90.255701