Abstract
Melting and phase transitions of phosphorus allotropes have been studied in the 2–11 GPa pressure range using in situ electrical resistivity measurements and synchrotron X-ray diffraction. It was found that the melting curve of rhombohedral phosphorus exhibits a positive slope of 58(2) K/GPa and crosses the rhombohedral–simple cubic phase boundary (negative slope of −420(70) K/GPa) at about 8.3 GPa and 1490 K. The melting slope of simple cubic phosphorus can be estimated to be +300(90) K/GPa. Calculations of phosphorus phase equilibria have been performed using our experimental and literature data within the framework of the phenomenological thermodynamics. The constructed equilibrium p–T phase diagram accurately describes the experimentally observed phase relations in solid and liquid phosphorus up to 12 GPa and 2000 K.
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