Vibrational and Transport Properties of Molecular Solids

  • K. H. Michel
Part of the NATO ASI Series book series (NSSB, volume 112)

Abstract

The study of crystals built up from molecules or molecular ions is a subject of increasing interest. Many interesting thermoelastic, electric and optic properties depend on the dynamics of the molecules. In addition to their center of mass motion (“translations”) the molecules possess orientational degrees of freedom (“rotations”). Very often there exists a high temperature crystalline phase where the molecules have no preferential orientation, such a crystal is called orientationally disordered crystal (ODIC). In general the symmetry of the molecule is lower than the symmetry of the surrounding site (for instance a dumbbell in an octahedral potentiall]). The molecule then occupies with equal probability several sterically different positions. This situation is realized by frequent reorientations of the individual molecule. The average orientational probability distribution function then has the symmetry of the crystalline site. At lower temperature, the high symmetry distribution breaks down and there occurs a transition to an orientationally ordered state of lower symmetry. In general the orientational ordering of the molecules is accompanied by a change in lattice structure. Such a situation is an indication of translation-rotation coupling.

Keywords

Optical Phonon Secular Variable Acoustic Phonon Inelastic Neutron Rotator Function 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1984

Authors and Affiliations

  • K. H. Michel
    • 1
  1. 1.Department of PhysicsUniversity of AntwerpWilrijkBelgium

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