Synthesis of n-type Bi2Te1-xSex compounds through oxide reduction process and related thermoelectric properties |
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| Affiliation: | 1. Department of Materials Science and Engineering, Tarbiat Modares University, Tehran, PO Box 14115-143, Iran;2. Materials Program, Arizona State University, Tempe, Arizona 85287-6106, USA;3. National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;1. CEA/DEN/DTN/SMTA/LIPC, Site de Cadarache, 13108 St-Paul lez Durance, France;2. ICSM, UMR 5257, CEA, CNRS, ENSCM, Univ. Montpellier, Site de Marcoule, BP 17171, 30207 Bagnols/Cèze, France;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China;3. Department of Mechanical Engineering, University of Kentucky, Lexington, 40506, USA;1. School of Materials and Engineering, Xi’an University of Technology, Xi’an 710048, China;2. Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA 24061, USA |
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| Abstract: | We propose a new process for the fabrication of n-type Bi2Te3-xSex (x = 0, 0.25, 0.4, 0.7) compounds. The compounds could be synthesized successfully using only oxide powders as the starting materials via the mechanical milling, oxidation, reduction, and spark plasma sintering processes. The controllability of the Se content could be ascertained by structural, electrical, and thermal characterizations, and the highest thermoelectric figure of merit (ZT) of 0.84 was achieved in Bi2Te2.6Se0.4 compound at 423 K without any intentional doping. This process provides a new route to fabricate n-type Bi2Te3-xSex compounds with competitive ZTs using all oxide starting materials. |
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| Keywords: | Thermoelectric Oxide reduction process Spark plasma sintering |
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