Preparation and thermoelectric properties of {ital p}- and {ital n}-type CoSb{sub 3}
- Jet Propulsion Laboratory/California Institute of Technology, 4800 Oak Grove Drive, MS 277/212, Pasadena, California 91109 (United States)
Large single crystals of the compound CoSb{sub 3} were grown from antimony rich melts by the Bridgman gradient freeze technique. CoSb{sub 3} has the skutterudite crystal structure and a peritectic decomposition temperature of 873 {degree}C. Samples were characterized by X-ray diffractometry, microprobe analysis and density measurements. A Debye temperature of 306 K was calculated from speed of sound measurements. As-grown CoSb{sub 3} crystals show {ital p}-type conductivity. {ital N}-type samples were obtained over a wide range of doping level by addition of Te. Seebeck coefficient, electrical resistivity, thermal conductivity and Hall effect measurements were performed between room temperature and 500 {degree}C. The results of these measurements are presented and discussed. Exceptionally high Hall mobilities were obtained on {ital p}-type samples which is consistent with the high degree covalency of the skutterudite crystal structure. A maximum room temperature Hall mobility of 3445 cm{sup 2}.V{sup {minus}1}.s{sup {minus}1} was measured on a sample with a carrier concentration of 4{times}10{sup 17} cm{sup {minus}3}. {ital N}-type samples were found to have substantially lower Hall mobilities in the range of temperature investigated. A bandgap of 0.55 eV was calculated from the high temperature electrical resistivity and Hall effect measurements. The hole and electron effective masses were also estimated. Based on the experimental data obtained, the potential of CoSb{sub 3} as a thermoelectric material is discussed. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 174436
- Report Number(s):
- CONF-940830-; ISSN 0094-243X; TRN: 96:003254
- Journal Information:
- AIP Conference Proceedings, Vol. 316, Issue 1; Conference: 13. international conference on thermoelectrics, Kansas City, MO (United States), 30 Aug - 1 Sep 1994; Other Information: PBD: 10 Aug 1994
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANTIMONY COMPOUNDS
THERMOELECTRIC PROPERTIES
COBALT COMPOUNDS
THERMOELECTRIC MATERIALS
CRYSTAL GROWTH
MONOCRYSTALS
X-RAY SPECTROSCOPY
DEBYE TEMPERATURE
P-TYPE CONDUCTORS
N-TYPE CONDUCTORS
SEEBECK EFFECT
ELECTRIC CONDUCTIVITY
HALL EFFECT
CARRIER DENSITY
TEMPERATURE DEPENDENCE
EFFECTIVE MASS
THERMAL CONDUCTIVITY