Abstract
The melting curve of elemental sulfur was measured to pressures of 65 GPa in a laser-heated diamond-anvil cell using ex situ textural analyses combined with spectroradiometry and benchmarked with laser-power-temperature functions. The melting curve reaches temperatures of by 65 GPa and is smooth in the range of 23–65 GPa with a Clapeyron slope of at 23 GPa. This is consistent with melting of a single tetragonal sulfur structure in this range, which is confirmed by in situ x-ray diffraction. An updated equation of state for tetragonal sulfur is determined, and the high-pressure, high-temperature stability region of tetragonal sulfur is reassessed.
1 More- Received 14 November 2018
- Revised 10 July 2019
DOI:https://doi.org/10.1103/PhysRevB.100.054106
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