Figure 4

Phase diagram of dense hydrogen.

For the plasma phase transition boundary, we show a range of curves resulting from reported theoretical calculations^{10,11,12,13,15} by black broken lines. The predicted position of the critical point is indicated by dotted box¹³. Melting curve and phase boundaries of solid hydrogen are taken from the literature⁸. Cross and plus symbols represent P-T conditions at which electrical conductivities were measured under shock compression⁵.