The experimental conditions necessary for the resistometric detection of the pressure-induced bismuth III-IV transition are given and a value of 42·7 kilobars obtained for the start of the transition. The resistance-pressure characteristic shows the shape of the forward transition. A short discussion of recent crystallographic data suggests that the transition may be due to a modification of the lamellar structure of the bismuth III polymorph.
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Steven P. Nichols (1971) studied this question.
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