High-pressure melting curves of argon, krypton, and xenon: Deviation from corresponding states theory

The melting curves of argon, krypton, and xenon were measured in a laser he ated diamond-anvil cell to pressures of nearly 80 GPa reaching melting temp eratures around 3300 K. For the three gases, we observed a considerable dec rease in the melting slopes (dT/dP) from the predictions based on correspon ding states scaling starting near 40, 30, and 20 GPa, respectively. The mel ting anomaly can be understood in terms of a model in which hcp stacking fa ults act as solutes in a binary system.