Title: When does a crystal conduct heat like a glass?
Authors: Keppens, Veerle
Sales, BC
Mandrus, D
Chakoumakos, BC
Laermans, Christiane #
Issue Date: Dec-2000
Publisher: Taylor & francis ltd
Series Title: Philosophical magazine letters vol:80 issue:12 pages:807-812
Abstract: Semiconducting crystalline materials that are poor conductors of heat are important as thermoelectric materials and for technological applications involving thermal management. A combination of neutron scattering, low-temperature ultrasonic attenuation and thermal conductivity measurements are reported on single crystals of the semiconductors Sr8Ga16Ge30 and Ba8Ga16Ge30. Taken together, these measurements suggest specific structural features that result in a crystal with the lowest possible thermal conductivity, namely that of a glass with the same chemical composition. Weakly bound atoms that 'rattle' within oversized atomic cages in a crystal result in a low thermal conductivity, but the present data show that both 'rattling' atoms and tunnelling states are necessary to produce a true glass-like thermal conductivity.
ISSN: 0950-0839
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Semiconductor Physics Section
# (joint) last author

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