Monaco G, Falconi S, Crichton W A, Mezouar M
European Synchrotron Radiation Facility, Boîte Postale 220, F-38042 Grenoble Cedex 9, France.
Phys Rev Lett. 2003 Jun 27;90(25 Pt 1):255701. doi: 10.1103/PhysRevLett.90.255701.
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.
