Electrical behavior of Se and Te to pressures of about 500 kbar

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Abstract
Using sintered diamond tipped carbide piston apparatus, and techniques of temperature‐cycling the specimens while under pressure, the electrical resistance behavior of various kinds of Se specimens and of Te specimens has been explored as a function of pressure up to about 500 kbar. In general, earlier reported behavior to about 160 kbar was confirmed. New information includes: (i) Any type of initial Se goes to a stable metallic form above about 250 kbar. (ii) The ’’130 kbar metallic phase’’ of Se is probably the same as the ’’250 kbar metallic phase’’. (iii) The resistivity of metallic Se is very pressure sensitive, much more so than metallic Te. (iv) The activation energy of electrical conduction vs pressure results supports the earlier proposal that above 140 kbar Se goes into a high pressure semiconducting phase, which at about 250 kbar transforms to a metallic phase.