Thermoelectric Properties of N-Type Bi2(Tel-xSex)3 Fabricated by Mechanical Alloying and Hot Pressing
Tóm tắt
Thermoelectric properties of polycrystalline Bi2(Te1-xSex)3 (0.05 ≤ × ≤ 0.25), fabricated by mechanical alloying and hot pressing, have been investigated. Formation of n-type Bi2(Te0.9 Se0.1)3 alloy powders was completed by mechanical alloying for 3 hours at ball-to-material ratio of 5: 1, and processing time for Bi2(Te1-xSex)3 formation increased with Bi2Se3 content x. Figure-of-merit of Bi2(Te0.9Se0.1) was markedly increased by hot pressing at temperatures above 450°C, and maximum value of 1.9 × 10-3/K was obtained by hot pressing at 550°C. With addition of 0.015 wt% Bi as acceptor dopant, figure-of-merit of Bi2 (Te0.9Se0.1)3, hot pressed at 550°C, could be improved to 2.1 × 10-3/K. When Bi2(Te1-xSex)3 was hot pressed at 550°C, figure-of-merit increased from 1.14 × 103/K to 1.92 × 10-3/K with increasing Bi2Se3 content x from 0.05 to 0.15, and then decreased to 1.30 × 103/K for x = 0.25 composition.
Tài liệu tham khảo
D. M. Rowe, CRC Handbook of Thermoelectrics, p.605, CRC Press, Inc., Bona Raton (1995)
W. M. Yim and F. D. Rosi, J. Solid State Electronics, 15, 1121 (1972)
I. J. Ohsugi, T. Kojima, and I. A. Nishida, J. Appl. Phys., 68, 5692 (1990)
K. Hasezaki, M. Nishimura, M. Umata, H. Tsukuda, and M. Araaoka, Proc. 12th ICT, 307 (1993)
B. A. Cook, B. J. Beaudry, J. L. Harringa, and W. J. Barnett, Proc. 9th ICT, 234 (1990)
D. M. Rowe, V. S. Shukla, and N. Savvides, Nature, 290, 765 (1981)
A. Yanagitani, S. Nishikawa, Y. Kawai, S. Hayashimoto, N. Itoh, and T. Kataoka, Proc 12th ICT, 281 (1993)
T. C. Harman, J. H. Cahn, and M. J. Logan, J. Appt. Phys., 30, 9 (1959)
M. Carle, D. Perrin, T. Caillat, S. Scherrer, and H. Scherrer, Proc. 10th ICT, 27 (1991)
J. P. Hugh and W. A. Tiller, Trans. Mat Soc. AIME, 215, 651 (1959)
G. R. Miller and C.-Y. Li, J. Phys. Chem. Solids, 26, 173 (1965)
D. M. Gel’fgat and Z. M. Dashevskii, Inorg. Mat., 19, 1172 (1984)