Thermoelectric properties of the textured Bi1.9Gd0.1Te3 compounds spark-plasma-sintered at various temperatures |
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| Affiliation: | 1. Belgorod State University, Belgorod 308015, Russian Federation;2. Belgorod State Technological University Named After V.G. Shukhov, Belgorod 308012, Russian Federation;1. School of Materials, University of Manchester, Manchester, M13 9PL, UK;2. Faculty of Science and Technology, Thammasat University, Pathum Thani, 12120, Thailand;3. Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, UK;1. Belgorod State University, Belgorod 394015, Russian Federation;2. Belgorod State Technological University named after V.G. Shukhov, Belgorod 308012, Russian Federation;1. Center for Electronic Materials, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea;2. Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea;3. High Temp. Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea;4. Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea;5. Yonsei-KIST Convergence Research Institute, Seoul 02792, Republic of Korea;6. Division of Nano & Information Technology, KIST School, Korea University of Science and Technology, Seoul 02792, Republic of Korea;1. Belgorod State University, Belgorod 394015, Russian Federation;2. Belgorod State Technological University named after V.G. Shukhov, Belgorod 308012, Russian Federation;1. Daegu Gyeongbuk Institute of Science and Technology (DGIST), 50-1 Sang-ri, Hyeonpung-myeon, Dalseong-gun, Daegu 711-873, Republic of Korea;2. Department of Advanced Energy Material Science and Engineering, Catholic University of Daegu, 330 Geumrak 1-ri, Hayang-eup, Gyeongsan 712-702, Republic of Korea |
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| Abstract: | Elemental composition, crystal and grain structures, specific electrical resistivity, Seebeck coefficient, thermal conductivity, and thermoelectric figure-of-merit of n-type grained Bi1.9Gd0.1Te3 compounds, spark-plasma-sintered at TS = 690, 720, 750, 780 and 810 K, have been studied. All the samples are highly textured along the 001 direction parallel to the pressing direction. The average grain size measured along the pressing direction is much less as compared to the average grain size measured in the perpendicular direction. A strong anisotropy in the transport properties measured along directions parallel and perpendicular to the pressing direction was found within the 290 ÷ 630 K interval. Electrical resistivity decreases and thermal conductivity increases for parallel orientation as compared to these properties for perpendicular orientation. The TS - effect on thermoelectric figure-of-merit of textured Bi1.9Gd0.1Te3 compounds has been found and analyzed. Highest thermoelectric figure-of-merit (～0.75) was observed for sample with TS = 750 K at perpendicular orientation. |
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| Keywords: | Bismuth telluride Spark plasma sintering Thermoelectric properties Anisotropy Textured grain structure |
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