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Abstract
One of the most interesting of the physical phenomena of materials investigated under pressure is the transition to the metallic state exhibited by some insulators and semiconductors. Experimental results concerning this transition in a number of substances are reviewed and discussed. The transition to the metallic state under high pressure occurs by one of two mechanisms. In the first, the metallic state is reached as a result of a continuous decrease and eventual disappearance of the energy gap. This case is exemplified by the pressure behavior of thallous iodide and iodine. In the second mechanism, the metallic state appears discontinuously as a result of a first-order phase transformation to a more closely packed lattice. The transitions in silicon, germanium, and some group III-V and II-VI compounds offer good examples of the latter mechanism. Possible geophysical implications of the results are discussed.
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