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Reduced thermal conductivity due to scattering centers in p-type SiGe alloysSpark erosion was used to produce ultra-fine particles of SiGe thermoelectric material and boron nitride, an inert phonon-scattering material. A homogeneous powder was made by mixing the two powders. The mixture was hot pressed to produce a thermoelectric material with uniformity dispersed, ultra-fine, inert, phonon-scattering centers. It is shown that, in samples with inert boron nitride or silicon nitride, thermal conductivity of a SiGe alloy can be reduced by about 25 percent while maintaining the electrical properties of the samples. Annealing of all the samples at 1525 K caused grain growth to over a micron, eliminating the detrimental effect attributable to small grains. Only in the sample with boron nitride the thermal conductivity did remain well below that for standard p-type SiGe (about 25 percent), while the electrical resistivity and Seebeck coefficient were very close to the values for standard p-type 80/20 SiGe.
Document ID
19930042032
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Beaty, John S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Rolfe, Jonathon L.
(Thermo Electron Technologies Corp. San Diego, CA, United States)
Vandersande, Jan
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Fleurial, Jean-Pierre
(JPL Pasadena, CA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: IECEC '92; Proceedings of the 27th Intersociety Energy Conversion Engineering Conference, San Diego, CA, Aug. 3-7, 1992. Vol. 3 (A93-25851 09-44)
Publisher: Society of Automotive Engineers, Inc.
Subject Category
Solid-State Physics
Accession Number
93A26029
Funding Number(s)
CONTRACT_GRANT: JPL-958486
CONTRACT_GRANT: NAS7-918
Distribution Limits
Public
Copyright
Other

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