The melting curve of potassium has been measured experimentally to 22 GPa using in situ X-ray diffraction and gas-membrane diamond anvil cells equipped with external resistive heating. The evolution of the melting temperature with pressure is similar to that of sodium, but it is different to that reported previously. A melting maximum is found in the stability field of the bcc-phase, at 5.8(5) GPa, followed by a decrease in the melting temperature down to a melting minimum at the fcc-host-guest (tI19) transition at 19(1) GPa. The bcc-fcc-liquid and fcc-tI19-liquid triple points are found to be at 466(10) K and 13.6(3) GPa and at 390(10) K and 19.0(3) GPa, respectively.
|Number of pages||7|
|Journal||Physical review B: Condensed matter and materials physics|
|Publication status||Published - 12 Aug 2011|
- DIAMOND-ANVIL CELL