Efficiency in a Tetrahedral-Anvil Press as Related to Anvil and Pyrophyllite Size

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Abstract
The efficiency of a tetrahedral‐hinge high pressure apparatus was studied using four anvil sizes from 38.1 to 63.5 mm on the edge and the transitions of bismuth I‐II (25.4 kbar), thallium (37 kbar), and barium (59 kbar) as calibration points. Efficiency is defined as the pressure of the transition divided by the applied pressure (load per anvil area) to obtain the transition. The sizes of tetrahedra were varied to determine maximum efficiency at each pressure. Correlation of these data with those of previous workers shows (1) that the maximum efficiency for each transition is constant for anvils from 12.7 to 63.5 mm on the edge; and (2) that the size ratio giving maximum efficiency is a function of pressure. These data are discussed in relation to the flow and compression of pyrophyllite in the gaskets and cavity.