SHOCK-WAVE COMPRESSION OF MIXTURES OF POWDERS WITH LIQUEFIED GASES

A new approach in physical chemistry at high pressures has been theoretically proposed and experimentally confirmed. The approach is based on shock compression of solid particles placed in liquefied gas with preservation of the products after compression. Shock compression of such heterogeneous systems has been shown to result in very high temperature states with subsequent rapid and deep cooling of the solid phase due to heat dissipation into the evaporating gas which expands after compression during the isentropic decrease of pressure. The cooling promotes preservation of the shock-formed metastable structures. As a result of specific combinations of high pressures and temperatures, usually inaccessible and insufficiently known regions of the P,T-state diagram can be achieved. © 1990 American Chemical Society.