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Improving the thermoelectric properties of Bi2Te2.7Se0.3 through La2O3 dispersion.

Authors :
Cao, Ruijuan
Liu, Xin
Tian, Zengguo
Zhang, Yingjiu
Li, Xin-Jian
Song, Hongzhang
Source :
Applied Physics A: Materials Science & Processing; Dec2022, Vol. 128 Issue 12, p1-7, 7p
Publication Year :
2022

Abstract

Theoretically, nanosecond phase dispersion is an effective method to optimize the performance of thermoelectric materials due to the energy filtering effect and strong phonon scattering. Because of the chemical stability of La<subscript>2</subscript>O<subscript>3</subscript>, it may be used as a second phase material in Bi<subscript>2</subscript>Te<subscript>2.7</subscript>Se<subscript>0.3</subscript> matrixes. After the introduction of La<subscript>2</subscript>O<subscript>3</subscript>, its electric transport performance decreases slightly, but its thermal transport performance increases further. Finally, its thermoelectric performance is optimized. At 455 K, the maximum dimensionless thermoelectric figure of merit (ZT) value of Bi<subscript>2</subscript>Te<subscript>2.7</subscript>Se<subscript>0.3</subscript> + 0.5 wt% La<subscript>2</subscript>O<subscript>3</subscript> reaches 0.97. The experimental results demonstrate that La<subscript>2</subscript>O<subscript>3</subscript> dispersion can improve the thermoelectric properties of Bi<subscript>2</subscript>Te<subscript>2.7</subscript>Se<subscript>0.3</subscript> effectively<subscript>.</subscript> [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09478396
Volume :
128
Issue :
12
Database :
Complementary Index
Journal :
Applied Physics A: Materials Science & Processing
Publication Type :
Academic Journal
Accession number :
160908264
Full Text :
https://doi.org/10.1007/s00339-022-06261-x