Experimental research on high pressure phase transitions of Mo and Ta

Abstract

The high pressure phase transitions of Mo and Ta were investigated experimentally. More melting temperatures were obtained by shock wave experiments. The measured melting temperature at lowest pressure is still much higher than that of DAC experiments. By measurements of sound velocities of Ta in reverse-impact shock wave experiments, a discontinuity of longitudinal sound velocity against shock pressure at ∼60GPa was observed. It may be concluded that a solid-solid phase transition exists.