Author(s) Sist, M.; Fischer, K.Frederik F.; Kasai, H.; Iversen, B.Brummerste
Journal Angew Chem Int Ed Engl
Date Published 2017 Mar 20

Anharmonic lattice vibrations govern heat transfer in materials, and anharmonicity is commonly assumed to be dominant at high temperature. The textbook cubic ionic defect-free crystal CsCl is shown to have an unexplained low thermal conductivity at room temperature (ca. 1 W/(m K)), which increases to around 13  W/(m K) at 25 K. Through high-resolution X-ray diffraction it is unexpectedly shown that the Cs atomic displacement parameter becomes anharmonic at 20 K.

DOI 10.1002/anie.201700638
ISSN 1521-3773
Citation Angew Chem Int Ed Engl. 2017;56(13):36253629.

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