Pressure calibration for the cubic press by differential thermal analysis and the high-pressure fusion curve of aluminum

Abstract

Cell pressures in the cubic press have been determined by means of differential thermal analysis (DTA) based on the known fusion curve of aluminum. The results compared favorably with those of the well-known fixed-point method, based on pressure-induced phase transitions in bismuth (I–II, 2.55 GPa) and thallium (II–III, 3.68 GPa). The high-pressure fusion curve of lead was measured using our calibrated results, which agreed well with those of the previous work. All of this was made possible by the development of a successful cell assembly for the DTA analyses in the cubic press. Details of the design are described in the present work.

Keywords:

• pressure calibration
• cubic press
• differential thermal analysis
• aluminum melting point