Predictions of the solid-parahydrogen phase diagram

Abstract

The hcp-fcc phase transition of parahydrogen is predicted on the basis of a quantum cell model, which was successful in matching experimental data on helium. The hcp-fcc-fluid triple point is estimated to occur near 23 K and 0.35 kbar. The phase line is then predicted to curve over and intercept the pressure axis at 0 K, at a pressure of about 11 kbar (1.1 GPa).