Thermoelectric Properties of Scandium Sesquitelluride
Thermal Energy Conversion Research and Advancement Group, Jet Propulsion Laboratory/California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
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Materials 2019, 12(5), 734; https://doi.org/10.3390/ma12050734
Received: 1 February 2019 / Revised: 26 February 2019 / Accepted: 27 February 2019 / Published: 4 March 2019
(This article belongs to the Special Issue Advances in Zintl Phases)
Rare-earth (RE) tellurides have been studied extensively for use in high-temperature thermoelectric applications. Specifically, lanthanum and praseodymium-based compounds with the Th3P4 structure type have demonstrated dimensionless thermoelectric figures of merit (zT) up to 1.7 at 1200 K. Scandium, while not part of the lanthanide series, is considered a RE element due to its chemical similarity. However, little is known about the thermoelectric properties of the tellurides of scandium. Here, we synthesized scandium sesquitelluride (Sc2Te3) using a mechanochemical approach and formed sintered compacts through spark plasma sintering (SPS). Temperature-dependent thermoelectric properties were measured from 300–1100 K. Sc2Te3 exhibited a peak zT = 0.3 over the broad range of 500–750 K due to an appreciable power factor and low-lattice thermal conductivity in the mid-temperature range.
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Keywords:
thermoelectric; rare-earth telluride; scandium telluride
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MDPI and ACS Style
Cheikh, D.; Lee, K.; Peng, W.; Zevalkink, A.; Fleurial, J.-P.; Bux, S.K. Thermoelectric Properties of Scandium Sesquitelluride. Materials 2019, 12, 734. https://doi.org/10.3390/ma12050734
AMA Style
Cheikh D, Lee K, Peng W, Zevalkink A, Fleurial J-P, Bux SK. Thermoelectric Properties of Scandium Sesquitelluride. Materials. 2019; 12(5):734. https://doi.org/10.3390/ma12050734
Chicago/Turabian StyleCheikh, Dean; Lee, Kathleen; Peng, Wanyue; Zevalkink, Alexandra; Fleurial, Jean-Pierre; Bux, Sabah K. 2019. "Thermoelectric Properties of Scandium Sesquitelluride" Materials 12, no. 5: 734. https://doi.org/10.3390/ma12050734
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