Thermoelectric Properties of n-Type AgPbSbTe Composites Containing Nanoscaled Phases

Abstract:

The effects of nanophase additions on the thermoelectric properties of n-type AgPb18SbTe20 fabricated by combining fast melting and hot pressing were investigated. The presence of sovelthermally syntheszied AgPb18SbTe20 nanospheres or nanorods in the bulk yields remarkably improved thermoelectric properties. Nanophase additions produce a reduction in the Seebeck coefficent at about 300~550 K and the maximum Seebeck coefficient absolute values are, respectively, 378 and 380 μV·K-1 for LAST-18 with nanospheres and nanorods samples. The κ values of two samples with nanophases show a lower value in the entire temperature range compared to that of LAST-18 matrix. A maximum figure of merit, ZT=0.92 at 673K for the nanorod-containing composite is achieved mainly due to the reduced thermal conductivity. Furthermore, the temperature of ZT peak shift to a higher range originated from the enlarged energy gap.

• Periodical: Applied Mechanics and Materials (Volume 456)
• Pages: 490-493
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.456.490
• Online since: October 2013
• Authors: Jing Liu, Liang Ming Peng*
• Keywords: Hot Pressing, Nanoomposites, PbTe, Thermoelectric Properties

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