New Phase Transformation in InSb at High Pressure and High Temperature

A new phase transformation at high pressure and elevated temperature has been found in the InSb pressure-temperature phase diagram. This transformation to a new phase designated as InSb-III has been established by measurements of superconducting transition temperature (Tc) as a function of annealing temperature at several pressures and by x-ray determinations on the new phase, both retained at one atmosphere and at high pressure and temperature. The higher Tc for InSb-III (Tc = 4.1°±0.1°K) and the x-ray results lead to the conclusion that InSb-III is a new phase different from the orthorhombic phase (Tc = 3.5°K).