Abstract
The microstructure and thermoelectric properties of Bi2Te3–Bi2Se3 solid solution samples of n‑type of conductivity containing 20 mol % of Bi2Se3 doped with Hg2Cl2 have been studied. The samples have been obtained by hot pressing, extrusion, and spark plasma sintering of powders prepared by melt spinning and ingot grinding in a ball mill. The microstructure of the samples has been studied by optical and scanning electron microscopy. The influence of the disk rotation speed on the morphology of particles obtained by melt spinning has been studied. Thermoelectric parameters, such as Seebeck coefficient, electrical conductivity, and thermal conductivity have been measured at room temperature and in the temperature range from 100 to 700 K. Using these parameters, the thermoelectric figure of merit has been calculated. It has been found that the samples have anisotropy of electrical conductivity (σ) and thermal conductivity (κ) in the directions perpendicular and parallel to pressing, and the Seebeck coefficient (α) is isotropic. The anisotropy factors at 300 K are determined: σ⊥/σ|| ~ 2.7; κ⊥/κ|| ~ 2.1, and α⊥/α|| ~ 1. The highest thermoelectric figure of merit (ZT) = 1.0 ± 0.1 at ~470 K was observed for samples extruded from powders prepared by ingot grinding and hot-pressed samples from powders obtained by melt spinning.
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ACKNOWLEDGMENTS
The authors are grateful to the staff of the Moscow State Technical University “STANKIN” for preparing the samples by the spark plasma sintering.
Funding
The study was carried out according to the State assignment no. 075-01176-23-00.
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Translated by S. Rostovtseva
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Ivanova, L.D., Granatkina, Y.V., Nikhezina, I.Y. et al. Chalcogenides of Bismuth Obtained by Various Methods. Inorg. Mater. Appl. Res. 14, 1220–1227 (2023). https://doi.org/10.1134/S2075113323050155
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DOI: https://doi.org/10.1134/S2075113323050155