Nano Archive

Nanostructures in high-performance (GeTe)(x)(AgSbTe2)(100-x) thermoelectric materials

Yang, S. H. and Zhu, T. J. and Sun, Tichang and Zhang, S. N. and Zhao, X. B. and He, J (2008) Nanostructures in high-performance (GeTe)(x)(AgSbTe2)(100-x) thermoelectric materials. NANOTECHNOLOGY, 19 (24).

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The thermoelectric properties of (GeTe)(x)(AgSbTe2)(100-x) compounds (x = 75, 80, 85 and 90; TAGS-x) have been studied as a function of temperature from 300 to 720 K. At 720 K the dimensionless figure of merit ZT reaches the state-of-the-art value of 1.53 for TAGS-75 and 1.50 for TAGS-80 and TAGS-85 samples, respectively. But the ZT value of the TAGS-90 sample is only 0.50 at 720 K due to the high carrier concentration. Utilizing high-resolution transmission electron microscope and selected area electron diffraction techniques, we identify a considerable number of nanoscale domains with typical size similar to 10 nm in the samples that show high ZT values. It is suggested that the presence of nanoscale domains, like the situation in PbTe-AgSbTe2 compounds, should make a slight contribution to the low lattice thermal conductivity of TAGS compounds due to the enhanced mid-frequency phonon scattering.

Item Type:Article
Subjects:Physical Science > Nanophysics
Material Science > Nanochemistry
Material Science > Nanostructured materials
ID Code:2341
Deposited By:Anuj Seth
Deposited On:18 Dec 2008 11:35
Last Modified:31 Mar 2009 15:56

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