Piston Cylinder Press

To investigate the pressure/temperature regime of the Earth´s crust and shallow parts of the upper mantle, at the GFZ three piston cylinder presses are installed and run. Two of the three presses are non-endloaded piston cylinder apparatus ("Johannes-type"), with which pressures up to 2.1 GPa and temperatures up to 1400°C can be reached. Salt/graphite- or natural fluorite/graphite-assemblages (latter for temperatures larger 800°C) are of 2.2 cm diameter. Pressures were calibrated according the equilibrium albite = jadeite + a-quartz. For experiments in the pressure range 2.0-5.0 GPa an endloaded piston-cylinder press ("Boyd & England-type") is used for temperatures up to 1650°C. For pressures up to 4.0 GPa salt/graphite-, salt/steel (as furnace material)-or pyrex-glass/pyrophyllite/graphite (for temperatures higher than 1000°C)-assemblages are of 1.27 cm (1/2 inch) diameter; for higher pressures 0.8 cm diameter salt/graphite-assemblages are used. Largest dimensions of precious metal capsules, natural or synthetic materials are welded within, are of 10 mm length and 6 mm in diameter. Variable experimental designs (e.g. up to four capsules in one run, buffered experiments) are possible. Pressure calibration is relied to the a-quartz -coesite transition. Temperatures are monitored by Ni/CrNi- or Pt/PtRh-thermocouples for both types of apparatus.

Endloaded piston-cylinder apparatus for pressures up to 5.0 GPa
Endloaded piston-cylinder apparatus for pressures up to 5.0 GPa
Schematic drawing of the sample assembly
Schematic drawing of the sample assembly

Contact

Mr. Dr. Bernd Wunder
Chemistry and Physics of Earth Materials

Telegrafenberg
Building D, room 323
14473 Potsdam
tel. +49 331 288-1412