The actual pressure and temperature at the melt of elemental vanadium

TL;DR

This paper investigates the true pressure and temperature conditions at vanadium's melting point, confirming linear thermal pressure behavior and correcting existing melting curve data for more accurate measurements.

Contribution

It introduces a correction method for vanadium melting data considering pressure thermal shifts and experimental conditions, refining the pressure scale for vanadium.

Findings

Linear thermal pressure vs. temperature confirmed experimentally

Correction of shock wave melting data for vanadium is necessary

Derived an accurate pressure scale for vanadium from diamond anvil cell data

Abstract

It is claimed that all of the pressure scales of the reported melting curves derived by diamond anvil cell experiments require a correction which takes into account the pressure thermal shift, where vanadium is an illustrative example. The linear behavior of the thermal pressure (Pth) vs. the temperature, as predicted by first principles theoretical assumptions is then experimentally confirmed. This allows extrapolation to determine of the actual pressure and thermal temperature at the melt. Accounting for the role of the pressure transmitting media in diamond anvil cell experiments, the analysis of elemental vanadium melting curve is presented. It is shown that the appropriate correction of shock waves melting data which takes into account the radiation absorbed by the LiF window, applies only to vanadium metal. The correct pressure scale of vanadium metal as derived by diamond anvil cell is presented.