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Thermoelectric Transport Properties of Co<sub>0.5</sub>Fe<sub>0.5</sub>Se<sub>2</sub>, Co<sub>0.5</sub>Fe<sub>0.5</sub>Te<sub>2</sub>, and Their Solid-Solution Compositions

Authors
Park, Sang JeongKim, SeyunPark, OkminLee, Se WoongKim, Sang-il
Issue Date
Sep-2023
Publisher
KOREAN INST METALS MATERIALS
Keywords
Thermoelectric; Solid solution; Transition metal chalcogenide; CoTe2; CoSe2; FeTe2; FeSe2
Citation
ELECTRONIC MATERIALS LETTERS
Indexed
SCIE
SCOPUS
KCI
Journal Title
ELECTRONIC MATERIALS LETTERS
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/68767
DOI
10.1007/s13391-023-00459-8
ISSN
1738-8090
2093-6788
Abstract
Transition- metal chalcogenides with tunable electronic transport properties and unique crystal structures have attracted much attention as potential thermoelectric materials. In this study, the electrical, thermal, and thermoelectrical transport properties of Co0.5Fe0.5Se2, Co0.5Fe0.5Te2 and a series of solid-solution compositions ( Co0.5Fe0.5(Se1-yTey)(2), y = 0.25, (0.5), and 0.75) were investigated. Co0.5Fe0.5Se2 and Co0.5Fe0.5Te2 polycrystalline alloys exhibited high power factors of 1.37 and 1.53 mW/mK(2) at 600 K, respectively, and their solid-solution compositions exhibited lower power factors between 0.38 and 0.81 mW/mK(2). The lattice thermal conductivities of Co0.5Fe0.5Se2 and Co0.5Fe0.5Te2 were (2).87 and 1.71 W/mK at 300 K, respectively, and their solid-solution compositions exhibited lower lattice thermal conductivities between 0.96 and 1.98 W/ mK. Consequently, the thermoelectric figure of merit (zT) of the Co0.5Fe0.5Se2 and Co0.5Fe0.5Te2 polycrystalline alloys was 0.16 and 0.18 at 600 K, respectively, and the zT of their solid-solution composition exhibited lower values between 0.04 and 0.09. As the solid-solution composition exhibited a lower thermoelectric performance than the Co0.5Fe0.5Se2 and Co0.5Fe0.5Te2 polycrystalline alloys, the lower thermoelectric performance was analyzed and discussed. [GRAPHICS.]
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공과대학 > Department of Materials Science & Engineering, major in Ceramic Engineering > Journal Articles

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