LEGEND
open squares: reversal obtaining low-pressure phase
closed squares: reversal obtaining high-pressure phase
diamonds: electrical resistivity change accompanying Bi transition

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This graph shows the pressure calibration for the 14/8 (ram force vs. the pressure of "fixed" transitions).  The Walker module is used for achieving pressures up to 25 GPa. In this device, six anvil "wedges" press on 8 cubes which in turn press on an octahedra press medium.  The press is calibrated using a variety of sample assemblies, using both castable ceramic and semi-sintered ceramic pressure media.  This configuration is used at Dr. Paul Asimow's lab at CalTech.  The 14/8 ass'y is configured as follows:
>>14 mm edge length octahedron made of semi-sintered MgO plus 5 wt% Cr₂O₃
>>Toshiba grade-F WC cubes with a truncated edge length of 8 mm
>>Stepped LaCrO₃ heater
>>Pyrophyllite gaskets with a cross section of 2.8 x 4.5 mm

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Rockland Research Corporation
16 Tompkins Avenue
West Nyack, NY  10994

Phone: (845) 353-4686
Fax: (845) 358-9119

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(Pressure chart courtesy of  CalTech Professors Paul Asimow and Jed Mosenfelder)