Correlation effects in metal ammonia systems

  • Juana V. Acrivos
  • A. S. Robertson
  • M. P. Klein
I. Ionic Liquids and Molten Salts
Part of the Lecture Notes in Physics book series (LNP, volume 172)


The recent structural and electrochemical measurements of the alkali metal-ammonia systems are reconciled in a model where the correlation energy leads to the formation of bound states. This is evident in the X-ray absorption of Rbx(NH3)1−x near the Rb K-edge as a white peak which appears only when the metal mole fraction is reduced below xc = 0.04. These transitions must be associated with the correlation effects which lead to the formation of sodium anions predicted by electrochemical measurements. If the anions act as impurity centers with a minus two valence change from the uniformly charged positive background, Friedel oscillations in the electron density must be taken into account in a statistical description of the system. The deviations of the activity coefficients from the usual Debye-Hückel expression are discussed.


Charge Density Wave Spin Density Wave Excess Free Energy Knight Shift Boltzmann Statistic 
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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • Juana V. Acrivos
    • 1
  • A. S. Robertson
    • 2
  • M. P. Klein
    • 2
  1. 1.San Jose State University
  2. 2.Lawrence Berkeley LaboratoryU.C.B.CA

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