Glass-Like Heat Conduction in Crystalline Semiconductors

Conference · Sun Jun 13 00:00:00 EDT 1999

OSTI ID:771518

Nolas, G S; Cohn, J L; Chakoumakos, B C; Slack, G A

The thermal conductivity and structural properties of polycrystalline and single crystal semiconductor type-1 germanium clathrates are reported. Germanium clathrates exhibit thermal conductivities that are typical of amorphous materials. This behavior occurs in spite of their well-defined crystalline structure. The authors employ temperature dependent neutron diffraction data in investigating the displacements of the caged strontium atoms in Sr{sub 8}Ga{sub 16}Ge{sub 30} and their interaction with the polyhedral cages that entrap them. Their aim is to investigate the correlation between the structural properties and the low, glass-like thermal conductivity observed in this compound.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (US)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 771518
• Report Number(s): P00-107283; TRN: AH200104%%320
• Resource Relation: Conference: 25th International Thermal Conditioning Conference/12th International Thermal Expansion Conference, Ann Arbor, MI (US), 06/13/1999--06/16/1999; Other Information: PBD: 13 Jun 1999
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ATOMS
CLATHRATES
GERMANIUM
MONOCRYSTALS
NEUTRON DIFFRACTION
STRONTIUM
THERMAL CONDUCTIVITY
THERMAL EXPANSION