Abstract
Features of atomic rattling motion (anharmonic thermal vibrations), a phenomenon that relates to a new route for devising materials for thermoelectric applications of complex metal alloys, have been detected in certain members of the RE 3Pd 20 X 6 ( RE = rare-earth element, X = Si or Ge) series of compounds relating to details of their particular crystal structure. In this work, thermal properties of Yb 3Pd 20Si 6 and Lu 3Pd 20Si 6 are reported as a first account of their position with respect to atomic rattling in an attempt to demystify the conditions that favour this dynamic materials property.
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