CALORIMETRIC INVESTIGATIONS OF (NACN)1-X(KCN)X GLASSES

Results of specific-heat investigations in the glassy state of (NaCN)1-x(KCN)x mixed crystals are presented, utilizing time-resolved and standard quasiadiabatic specific-heat techniques. Crystals with concentrations x=0.19, 0.59, and 0.85 were investigated, which exhibit frozen-in orientational disorder. At low temperatures (T21 K) the typical glasslike anomalies such as a logarithmic time dependence and a linear variation with temperature were detected. The existence of an excess contribution, which in glassy materials is usually termed a T3 excess heat capacity, could not be determined unambiguously. However, extra contributions to the specific heat were observed around 1 K. © 1990 The American Physical Society.