Abstract
The marcasite-type compounds XTe2 (X = Fe, Co, Ni) are function materials with electrical, magnetic, optical and superconducting application value. However, XTe2 are rare studied as thermoelectric materials. In this paper, the marcasite-type compounds XTe2 are prepared rapidly by vacuum solid-state reaction method. The sample interior is rich in micro-pores and complex crystal structures. The Seebeck coefficient value of FeTe2 changes from positive to negative, indicating that the semiconductor type changes from p-type to n-type as the temperature increases. In this system, the maximum Seebeck coefficient of 47.24 μV/K at 305 K is obtained for FeTe2. The lowest electrical resistivity of 1.45 μΩ m is obtained for NiTe2 at 567 K. The maximum power factor of the CoTe2 sample is 334.05 μW m−1 K−2 at 570 K. The order of the magnitude of the thermal conductivity of the marcasite samples is NiTe2 > CoTe2 > FeTe2, and the lowest thermal conductivity value ~ 2.29 W/(m K) is obtained for FeTe2 when the test temperature is 599 K. The maximum ZT value ~ 3.7 × 10–2 at 619 K is obtained for CoTe2.
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Acknowledgements
This work was financially supported by National Natural Science Foundation of China (52062031), Natural Science Foundation of Liupanshui Normal University (LPSSYKYJJ201902), Science and Technology Innovation Group of Liupanshui Normal University (LPSSYKJTD201905) and Liupanshui Key Laboratory of thermoelectric and electrode materials (52020-2020-0903).
Funding
Funding was provided by Natural Science Foundation of Liupanshui Normal University (Grant no. LPSSYKYJJ201902), Engineering and Technology Research Center of Liupanshan Resources (Grant no. LPSSYKJTD201905), Liupanshui Key Laboratory of Thermoelectric and Electrode Materials (Grant no. 52020-2020-0903), National Natural Science Foundation of China (Grant no. 52062031).
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ZB contributed to data curation, writing–original draft. YJ contributed to data curation. BQ contributed to writing-review and editing and funding acquisition.
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Bai, Z., Ji, Y. & Qin, B. Microstructure and thermoelectric properties of marcasite-type compounds XTe2 (X = Fe, Co, Ni) prepared by solid-state reaction. J Mater Sci: Mater Electron 34, 461 (2023). https://doi.org/10.1007/s10854-023-09915-5
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DOI: https://doi.org/10.1007/s10854-023-09915-5