When does a crystal conduct heat like a glass?

Autor:	Bryan C. Chakoumakos, David Mandrus, Veerle Keppens, Brian C. Sales, Christiane Laermans
Rok vydání:	2000
Předmět:	Materials science Condensed matter physics business.industry Mineralogy Neutron scattering Condensed Matter Physics Thermal conduction Thermoelectric materials Crystal Tunnel effect Thermal conductivity Semiconductor business Quantum tunnelling
Zdroj:	Philosophical Magazine Letters. 80:807-812
ISSN:	1362-3036 0950-0839
DOI:	10.1080/09500830010003830
Popis:	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, lowtemperature 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6a270cd742ceaf445b9d07c3fb772ade https://doi.org/10.1080/09500830010003830 Zobrazit plný text záznamu Plný text ve formátu PDF