Journal of Statistical Physics

, Volume 33, Issue 2, pp 241–260 | Cite as

The Clausius-Mossotti formula and its nonlocal generalization for a dielectric suspension of spherical inclusions

  • B. U. Felderhof
  • G. W. Ford
  • E. G. D. Cohen


Employing a recently developed cluster expansion for the effective dielectric constant of a suspension of spherical inclusions, we show which parts of the cluster integrals give rise to the Clausius-Mossotti formula. The same selection of terms is then used to obtain an approximate expression for the wave-vector-dependent effective dielectric tensor. For a system of hard spheres with only dipole polarizability this expression is evaluated in closed form. This last result is then used to derive the form of the electrostatic potential due to a point charge in the effective medium. For physically reasonable values of the polarizability, the potential has asymptotically the form corresponding to a medium with the Clausius-Mossotti dielectric constant, while at short range it oscillates about this form. For values of the polarizability beyond the physical range critical points are found at which the oscillations become long range.

Key words

Clausius-Mossotti formula cluster expansion random media dielectric suspectibility nonlocal 


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Copyright information

© Plenum Publishing Corporation 1983

Authors and Affiliations

  • B. U. Felderhof
    • 1
  • G. W. Ford
    • 2
  • E. G. D. Cohen
    • 3
  1. 1.Institut für Theoretische Physik ARWTH AachenAachenWest Germany
  2. 2.The University of MichiganAnn Arbor
  3. 3.The Rockefeller UniversityNew York

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