Abstract
We investigated the phase transformation of hot dense fluid hydrogen using static high-pressure laser-heating experiments in a laser-heated diamond anvil cell. The results show anomalies in the heating efficiency that are likely to be attributed to the phase transition from a diatomic to monoatomic fluid hydrogen (plasma phase transition) in the pressure range between 82 and 106 GPa. This study imposes tighter constraints on the location of the hydrogen plasma phase transition boundary and suggests higher critical point than that predicted by the theoretical calculations.
Highlights
We investigated the phase transformation of hot dense fluid hydrogen using static high-pressure laser-heating experiments in a laser-heated diamond anvil cell
We carried out three sets of laser-heating experiments on hydrogen using different laser-heated diamond anvil cell (LHDAC) to determine the plasma phase transition boundary
Dzyabura et al.[8] recently conducted similar laser heating experiments at 119 and 125 GPa and high temperatures in a LHDAC, and presented the evidence of the plasma phase transition, which is in good agreement with our data (Fig. 4)
Summary
We investigated the phase transformation of hot dense fluid hydrogen using static high-pressure laser-heating experiments in a laser-heated diamond anvil cell. The results show anomalies in the heating efficiency that are likely to be attributed to the phase transition from a diatomic to monoatomic fluid hydrogen (plasma phase transition) in the pressure range between 82 and 106 GPa. This study imposes tighter constraints on the location of the hydrogen plasma phase transition boundary and suggests higher critical point than that predicted by the theoretical calculations. The P-T conditions of the plasma phase transition determined in this study appear to be correlated with some previous theoretical predictions[10,11,12,13,15] and experimental results[8]
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