Abstract
A rapid-compression apparatus with a large pressure jump is described. The pressure jump was performed principally by using a large volume bladder-type power accumulator that contains compressed nitrogen and the connected electromagnetic valves. Maximum force induced by the press is 1.1 MN. Within 20 ms the pressure of the sample could be increased from 0.1 to 2.0 GPa in piston-cylinder modules of 26 mm diameter and to 5.8 GPa in Bridgman-type anvils of 26 mm top diameter. The apparatus has been used successfull in determining the Grűneisen parameter of NaCl at high pressures. Furthermore a metastable amorphous phase of poly (ethylene terephthalate) was solidified from its melt in a rapid compressing process; this phase could not be obtained by slow compressing to high pressure or by naturally cooling at ambient pressure.
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