Laser generated shock reflectance data show that diamond undergoes a continuous transition from optically absorbing to reflecting between Hugoniot pressures 600<PH<1000 GPa. The data are consistent with diamond having a thermal population of carriers at PH~600 GPa, undergoing band overlap metallization at PH~1000 GPa and melting at 800<PH<1000 GPa. The results agree well with an equation of state model that predicts that elemental carbon remains solid throughout the interior of Neptune.
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Bradley et al. (2004) studied this question.
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