Isentropic Compression of Substances Using Ultra‐High Magnetic Field: Zero Isotherms of Protium and Deuterium in Pressure Range up to ∼5 Mbar

Experiments on isentropic compression of a substance using a high magnetic field pressure are described. Their goal is building of a zero isotherm in a multi‐megabar pressures range. A method of the pressure and density determination of the compressed substance based on radiographic data obtained in the experiment is presented. The results of the experiments with solid (in initial state) protium and deuterium are presented. The densities that correspond to more than seventeen‐fold compression are reached. Obtained experimental points are compared with extrapolation of a curve that is built in the experiments using anvil cells and with the results of severalab‐initiocalculations (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)