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Measurements of low-temperature specific heat C, thermal conductivity, and dielectric dispersion have been made on crystalline samples of the superionic conductor Li₃N, the oxygen conductor Y₂O₃-stabilized ZrO₂, and the relaxation ferroelectric Pb₃ (MgNb₂) O₉. In each case, the behavior is similar to that found in amorphous materials. Data on other crystalline materials are reviewed to emphasize that the low-temperature phenomena found in glasses can occur in crystals. It is shown that a peak in C{T^3} appears to be correlated, in both amorphous and crystalline materials, with a nearly temperature-independent regime (plateau) in.
Ackerman et al. (Wed,) studied this question.