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Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2015

From crystal to glass-like thermal conductivity in crystalline minerals

Yohan Bouyrie
Christophe Candolfi
Bernard Malaman
Anne Dauscher
Bertrand Lenoir

Résumé

The ability of some materials with a perfectly ordered crystal structure to mimic the heat conduction of amorphous solids is a remarkable physical property that finds applications in numerous areas of materials science, for example, in the search for more efficient thermoelectric materials that enable to directly convert heat into electricity. Here, we unveil the mechanism in which glass-like thermal conductivity emerges in tetrahedrites, a family of natural minerals extensively studied in geology and, more recently, in thermoelectricity. By investigating the lattice dynamics of two tetrahedrites of very close compositions (Cu12Sb2Te2S13 and Cu10Te4S13) but with opposite glasslike and crystal thermal transport by means of powder and single-crystal inelastic neutron scattering, we demonstrate that the former originates from the peculiar chemical environment of the copper atoms giving rise to a strongly anharmonic excess of vibrational states.
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hal-01279097 , version 1 (20-02-2023)

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Yohan Bouyrie, Christophe Candolfi, Stéphane Pailhes, Michael Marek Koza, Bernard Malaman, et al.. From crystal to glass-like thermal conductivity in crystalline minerals. Physical Chemistry Chemical Physics, 2015, 17 (30), pp.19751-19758. ⟨10.1039/c5cp02900g⟩. ⟨hal-01279097⟩
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