Orientational glasses. II. Calculation of critical thresholds in ACNxMn1-x mixtures
Résumé
Using a simple steric hindrance based idea, critical thresholds which occur in the phase diagram of ACNxMn1-x mixtures, where A stands for K, Na or Rb while Mn represents Br, Cl or I, are calculated. The cyanide density x is divided into a free-to-reorient part xr, and a frozen-in part xf. The latter term xf is calculated from microscopic characteristics of the molecules involved. Two critical thresholds xc and xd for the disappearance of respectively, ferroelastic transitions and ferroelastic domains are obtained. The calculated values are in excellent agreement with available experimental results. Predictions are made for additionnal mixtures.
Domaines
Articles anciens
Origine : Accord explicite pour ce dépôt