Ion-Chain Dynamics in Polymer Electrolytes
  Representing polyether-salt systems by chains of interacting coordination shells, defined by the cation and by its nearest ligands, we derive the interaction potential between closest shells -- the inter-shells potential -- in terms of two-electron polarization effects. Values are presented for monovalent-based crystalline poly(ethylene oxide), PEO, electrolytes. For the eutectic composition $\text{PEO}_{12} \text{EuBr}_3$, the inter-shells energy is evaluated also by relating the empirical value of the nearest-ligands local-field potential with the variation of the $\text{Eu}^{3+}$ concentration. Both methods give the same results. 
L. D. Carlos, A. L. L. Videira (Department of Physics, University of   Aveiro, Portugal and Department of Physics, Universit...