Thermoelectric properties of pressure-sintered Si sub 0. 8 Ge sub 0. 2 thermoelectric alloys

The thermoelectric properties of 28 sintered Si{sub 0.8} Ge{sub 0.2} alloys, heavily doped with either boron or phosphorus and prepared from powders with median particle sizes ranging from about 1 {mu}m to over 100 {mu}m, have been determined from 300 to 1300 K. The thermal conductivity decreases wi...

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Bibliographic Details
Published in:Journal of applied physics 1991-04, Vol.69:8
Main Authors: Vining, C.B., Laskow, W., Hanson, J.O., Van der Beck, R.R., Gorsuch, P.D.
Format: Article
Language:English
Subjects:
360603 - Materials- Properties
ALLOYS
BORON ADDITIONS
BORON ALLOYS
ELECTRICAL PROPERTIES
FABRICATION
GERMANIUM ALLOYS
GERMANIUM COMPOUNDS
GERMANIUM SILICIDES
MATERIALS SCIENCE
PHONONS
PHOSPHORUS ADDITIONS
PHYSICAL PROPERTIES
QUASI PARTICLES
SILICIDES
SILICON ALLOYS
SILICON COMPOUNDS
SINTERING
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
THERMOELECTRIC PROPERTIES
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Summary:The thermoelectric properties of 28 sintered Si{sub 0.8} Ge{sub 0.2} alloys, heavily doped with either boron or phosphorus and prepared from powders with median particle sizes ranging from about 1 {mu}m to over 100 {mu}m, have been determined from 300 to 1300 K. The thermal conductivity decreases with decreasing particle size, however, the figure of merit is not significantly increased due to a compensating reduction in the electrical conductivity. The thermoelectric figure of merit is in good agreement with results of Dismukes {ital et} {ital al}. (J. Appl. Phys. {bold 10}, 2899 (1964)) on similarly doped alloys prepared by zone-leveling techniques. The electrical and thermal conductivity are found to be sensitive to preparation procedure while the Seebeck coefficient and figure of merit are much less sensitive. The high-temperature electrical properties are consistent with charge carrier scattering by acoustic or optical phonons.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.348408