DOI: 10.1002/adfm.201103049. Enhancement of Thermopower of TAGS‐85 High‐Performance Thermoelectric Material by Doping with the Rare Earth Dy

Enhancement of Thermopower of TAGS‐85 High‐Performance Thermoelectric Material by Doping with the Rare Earth Dy

10.1002/adfm.201103049

Crossref journal-article

Wiley

Advanced Functional Materials (311)

Abstract

AbstractEnhancement of thermopower is achieved by doping the narrow‐band semiconductor Ag6.52Sb6.52Ge36.96Te50(acronym TAGS‐85), one of the bestp‐type thermoelectric materials, with 1 or 2% of the rare earth dysprosium (Dy). Evidence for the incorporation of Dy into the lattice is provided by X‐ray diffraction and increased orientation‐dependent local fields detected by125Te NMR spectroscopy. Since Dy has a stable electronic configuration, the enhancement cannot be attributed to 4f‐electron states formed near the Fermi level. It is likely that the enhancement is due to a small reduction in the carrier concentration, detected by125Te NMR spectroscopy, but mostly due to energy filtering of the carriers by potential barriers formed in the lattice by Dy, which has large both atomic size and localized magnetic moment. The interplay between the thermopower, the electrical resistivity, and the thermal conductivity of TAGS‐85 doped with Dy results in an enhancement of the power factor (PF) and the thermoelectric figure of merit (ZT) at 730 K, fromPF= 28 μW cm−1K−2andZT≤ 1.3 in TAGS‐85 toPF= 35 μW cm−1K−2andZT≥ 1.5 in TAGS‐85 doped with 1 or 2% Dy for Ge. This makes TAGS‐85 doped with Dy a promising material for thermoelectric power generation.

Bibliography

Levin, E. M., Budâko, S. L., & SchmidtâRohr, K. (2012). Enhancement of Thermopower of TAGSâ85 HighâPerformance Thermoelectric Material by Doping with the Rare Earth Dy. Advanced Functional Materials, 22(13), 2766â2774. Portico.

Authors 3

E. M. Levin (first)
S. L. Bud'ko (additional)
K. Schmidt‐Rohr (additional)

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Dates

Type	When
Created	13 years, 4 months ago (April 10, 2012, 3:22 a.m.)
Deposited	1 year, 4 months ago (April 22, 2024, 9:38 p.m.)
Indexed	1 month, 1 week ago (July 19, 2025, 11:44 p.m.)
Issued	13 years, 4 months ago (April 10, 2012)
Published	13 years, 4 months ago (April 10, 2012)
Published Online	13 years, 4 months ago (April 10, 2012)
Published Print	13 years, 1 month ago (July 10, 2012)

Funders 0

None

BibTeX

@article{Levin_2012, title={Enhancement of Thermopower of TAGS‐85 High‐Performance Thermoelectric Material by Doping with the Rare Earth Dy}, volume={22}, ISSN={1616-3028}, url={http://dx.doi.org/10.1002/adfm.201103049}, DOI={10.1002/adfm.201103049}, number={13}, journal={Advanced Functional Materials}, publisher={Wiley}, author={Levin, E. M. and Bud’ko, S. L. and Schmidt‐Rohr, K.}, year={2012}, month=apr, pages={2766–2774} }

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