Application of sintered diamond tipped ultra high pressure apparatus to cryogenic experiments

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Abstract
The sintered diamond tipped, opposed piston, ultra high pressure apparatus developed in this laboratory in 1975 has been adapted to cryogenic experimentation by replacing the steel binding rings with nonbrittle stainless steel ones, and by providing it with a special stainless steel, squirrel‐cage type, clamp press capable of locking the apparatus at desired loadings and making it possible to insert the loaded assembly in a cryostat and be cooled to liquid helium temperatures. Experiments to pressures over 500 kbar and to temperatures down to 2.7 K have been carried out. The high pressure metallic forms of Te, Se, S, Si and I have been investigated, particularly in respect to superconduction phenomena.