Abstract
The results of a detailed calorimetric study of the NaNO 3/KNO 3 phase behaviour as a function of cation composition are presented. We conclude that the λ-transition in NaNO 3 is significantly depressed and broadened by the presence of K + ions. The α–β-transition in KNO 3 is similarly affected. The possibility is considered that the depression of the λ-transition by addition of solute K + ions is related to random field effects on model lattice transitions involving a continuous order parameter. Some brief remarks are made to contrast the fast ordering kinetics of the λ-transition with the slow kinetics, and structural arrests, obvious in supercooling liquids.
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