Low-temperature specific heat and glassy dynamics of a polymorphic molecular solid

[摘要] The low-frequency dynamics of different solid phases of ethanol (fully ordered crystal, orientational glass, and tore structural glass) is investigated by measurements of low-temperature specific heat as well as determination of the vibrational densities of states by inelastic neutron scattering. Such polymorphism provides a unique benchmark to study the relative importance of different kinds of disorder on glass-dynamics properties. The measurements are carried out both for hydrogenous and fully-deuterated samples. Large isotopic effects are found for the excess contributions (i.e., non-Debye) to the: specific heat of the disordered solids, which have clear correlates in the low-frequency spectra. [S0163-1829(98)05626-4].

[关键词] INTERMOLECULAR POTENTIAL FUNCTIONS;THERMAL-CONDUCTIVITY;AMORPHOUS SOLIDS;NEUTRON-SCATTERING;MODEL GLASS;CRYSTALLINE;TRANSITION;STATES;(KBR)1-X(KCN)X;GLYCEROL