Apparatus for phase-equilibrium measurements at pressures up to 50 kilobars and temperatures up to 1750°C

Abstract

Construction and calibration of apparatus utilizing a solid pressure medium for phase-equilibrium studies at elevated temperatures and pressures are described. Pressure calibration is carried out by measurement of the Bi I-Bi II and T1 II-T1 III transitions. A new determination of the thallium transition, 37.1±1.3 kilobars, is given. Tests indicate that talc is superior to pyrophyllite and boron nitride as a solid pressure medium for high-temperature work.