The basic effect of pressure is to increase overlap between adjacent electronic orbitals. There are a number of consequences of this increased overlap. In the first order, there is a delocalization of electrons, a broadening of the bands of allowed energy and a decrease in magnitude of the gaps of forbidden energy between bands. For an insulator or semiconductor there is a decrease in resistivity which may ultimately lead to metallic behavior. This is the classical picture observed in books like that of Seitz [1].


Electronic Transition Bridgman Anvil High Pressure Research Molecular Field Theory Reactive Ground State 
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  1. 1.
    F. SEITZ, Modern Theory of Solids, McGraw-Hill, New York (1940).Google Scholar
  2. 2.
    P. W. BRIDGMAN, Physics of High Pressure, G. Bell and Sons, Ltd., London (1949).Google Scholar

Copyright information

© H. G. Drickamer and C. W. Frank 1973

Authors and Affiliations

  • H. G. Drickamer
    • 1
  • C. W. Frank
    • 1
  1. 1.School of Chemical Sciences and Materials Research LaboratoryUniversity of IllinoisUrbanaUSA

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