CaltechAUTHORS
Published July 2015 | Version public
Journal Article Metadata-only

State of the art Ag_(50-x)Sb_xSe_(50-y)Te_y alloys: Their high zT values, microstructures and related phase equilibria

Creators

  • 1. ROR icon National Sun Yat-sen University
  • 2. ROR icon Institute of Physics, Academia Sinica
  • 3. ROR icon National Tsing Hua University
  • 4. ROR icon California Institute of Technology
  • 5. ROR icon ITMO University

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

Identifiers

Eprint ID
58828
Resolver ID
CaltechAUTHORS:20150709-134215783

Funding

National Science Council of Taiwan
100-2221-E-155-019
National Science Council of Taiwan
101-3113-P-008-001
Air Force Office of Scientific Research (AFOSR) Multidisciplinary University Research Initiative (MURI)

Dates

Created
2015-07-09
Created from EPrint's datestamp field
Updated
2021-11-10
Created from EPrint's last_modified field