The orientational glass (KBr) 1-x (KCN) x has been studied by 'adiabatic' specific heat measurements at temperatures between 2 and 50K. No specific heat anomaly was detectable. At low temperatures and in crystals with higher CN - concentrations (x=0.25 and x=0.53) the molecular system is effectively frozen-in. Only a small fraction of CN - molecules can equilibrate even on the timescale of these long-time measurements.
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Mertz et al. (1985) studied this question.
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