Specific heat and thermal conductivity of superionic conductors in the superionic phase

The temperature dependences of the specific heat and the thermal conductivity of crystalline superionic conductors LnF3 (Ln = La, Ce, Pr), Li2B4O7 and α-LiIO3 in the superionic phase have been investigated experimentally. The specific heat C p and the thermal conductivity K are observed to increase monotonically over a wide range of temperatures above the Debye temperature ΘD. This increase is attributed to the relaxational interaction of high-frequency phonons with two-level systems.

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