Extended and accurate determination of the melting curves of argon, helium, ice ( H 2 O ) , and hydrogen ( H 2 )

By F. Datchi, P. Loubeyre, R. Letoullec. 2000

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The Properties of Hydrogen and Helium Under Extreme Conditions (2011, methodology): “There is good agreement in the measured melting lines up to 20 GPa, but the measurements of SantamariaPerez et al., 2010 are in disagreement with an extrapolation of the measurements of Datchi et al., 2000 to higher pressures.”
Cold melting and solid structures of dense lithium (2011, background): “Whereas the melting temperatures of materials usually rise under pressure, and even the lightest condensed gases, hydrogen and helium, melt at temperatures of the order of 10 3 K at 50 GPa (refs&nbs”
A New Equation of State for Dense Hydrogen–Helium Mixtures (2019, methodology): “Dynamic quasi-isentropic shock wave experiments using high explosives on deuterium have been carried out up to about 1500 GPa (15 Mbar) and densities about 4.5 g cm−3, directly probing jovian planet deep interiors.”
Ruby under pressure (2008, background): “However, at around 100 GPa, the melting temperature of helium 271 extrapolates to 1000 K and DFT calculations predict elastic properties of He similar to those of platinum at ambient conditions 272 (see also J.”