Abstract

Construction d'une theorie de perturbation pour calculer la fonction de reponse des phonons et les proprietes thermodynamiques des solides ioniques, decrits par un modele de couche anharmonique. Dans le cas ou un potentiel effectif pour le noyau (cœur) peut etre defini, les resultats sont les memes que ceux fournis par la theorie de l'ion rigide. Proposition d'une generalisation du theoreme de Dyson applique a la theorie de l'ion rigide, pour ce modele de couche

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