Physics

Organic chemistry

Synchrotron

Melting temperature

X-ray crystallography

Gene

Analytical Chemistry (journal)

Optics

Catalysis

Composite material

Diffraction

Chemistry

Materials science

Diamond

Diamond anvil cell

In situ

Phase (matter)

Atmospheric temperature range

Chromatography

Polymerase chain reaction

Platinum

Biochemistry

Melting curve analysis

Thermodynamics

Scientific Reports

In this work, the melting line of platinum has been characterized both experimentally, using synchrotron X-ray diffraction in laser-heated diamond-anvil cells, and theoretically, using ab initio simulations. In the investigated pressure and temperature range (pressure between 10 GPa and 110 GPa and temperature between 300 K and 4800 K), only the face-centered cubic phase of platinum has been observed. The melting points obtained with the two techniques are in good agreement. Furthermore, the obtained results agree and considerably extend the melting line previously obtained in large-volume devices and in one laser-heated diamond-anvil cells experiment, in which the speckle method was used as melting detection technique. The divergence between previous laser-heating experiments is resolved in favor of those experiments reporting the higher melting slope.

In situ characterization of the high pressure – high temperature melting curve of platinum