State of the art Ag_(50-x)Sb_xSe_(50-y)Te_y alloys: Their high zT values, microstructures and related phase equilibria
Abstract
Turning waste heat into electricity using thermoelectric materials supports the crucial goals of the sustainable development. Two ternary chalcogenide compounds, the AgSbTe_2 and AgSbSe_2, are viewed as prospective candidates for mid-temperature waste heat recovery (600–800 K). Alloying between the cubic AgSbTe_2 and AgSbSe_2 yields to the very high zT peak value of 1.4 in Ag_(25)Sb_(25)Se_(10)Te_(40) and Ag_(25)Sb_(25)Se_5Te_(45) at 680 K, which are nearly 40% and 250% higher than those of undoped AgSbTe_2 (zT ∼ 1) and AgSbSe_2 (zT ∼ 0.4). The relations between the phase stability, the carrier concentration and the electronic/thermal transport property are understood by conducting comprehensive study along the pseudo-binary AgSbSe_2–AgSbTe_2 system with varying values of x and y in Ag_(50-x)Sb_xSe_(50-y)Te_y (25 ⩽ x ⩽ 30, y ⩽ 50).
Additional Information
© 2015 Acta Materialia Inc. Published by Elsevier Ltd. Received 21 September 2014, Revised 9 April 2015, Accepted 9 April 2015, Available online 27 April 2015. The authors acknowledge the financial support of the National Science Council of Taiwan (100-2221-E-155-019, 101-3113-P-008-001). TD and GJS acknowledge support of AFOSR MURI.Additional details
- Eprint ID
- 58828
- Resolver ID
- CaltechAUTHORS:20150709-134215783
- 100-2221-E-155-019
- National Science Council of Taiwan
- 101-3113-P-008-001
- National Science Council of Taiwan
- Air Force Office of Scientific Research (AFOSR) Multidisciplinary University Research Initiative (MURI)
- Created
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2015-07-09Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field