Nanostructure and thermoelectric properties of p-type Bi0.5Sb1.5Te3 compound prepared by melt spinning technique

Author

Xie, W.J. ; Tang, X.F. ; Chen, G. ; Jin, Q. ; Zhang, Q.J.

Author_Institution

State Key Lab. of Adv. Technol. for Mater. Synthesis & Process., Wuhan Univ. of Technol., Wuhan

fYear

2007

fDate

3-7 June 2007

Firstpage

23

Lastpage

26

Abstract

P-type Bi_0.5Sb_1.5Te₃ bulk material with fine nanostructure has been prepared by combining melt spinning technique with spark plasma sintering (SPS), and the effects of microstructure on the thermoelectric transport properties are investigated. Bi_0.5Sb_1.5Te₃ ribbons with fine nanostructure are obtained during the melt spinning process and the grain sizes of Bi_0.5Sb_1.5Te₃ are about 5-15 nm observed by High-resolution transmission electron microscopy. Such structure has great influence on thermoelectric transport properties of Bi_0.5Sb_1.5Te₃ compound. Compared with zone melting and directing SPS samples, the lattice thermal conductivity of the sample processed by melt spinning decreases significantly due to the intensive phonon scattering induced by the fine nanostructure. The greatest thermoelectric figure of merit (ZT) of 1.20 is obtained at 300K for the sample which is prepared by melt spinning with roller linear speed of 10 m/s.

Keywords

antimony compounds; bismuth compounds; grain size; melt spinning; nanostructured materials; phonons; plasma materials processing; sintering; thermal conductivity; thermoelectricity; transmission electron microscopy; zone melting; Bi_0.5Sb_1.5Te₃; grain sizes; high-resolution transmission electron microscopy; intensive phonon scattering; lattice thermal conductivity; melt spinning technique; microstructure; nanostructure material; ribbons; spark plasma sintering; temperature 300 K; thermoelectric figure of merit; thermoelectric transport properties; zone melting; Bismuth; Nanostructured materials; Plasma materials processing; Plasma properties; Plasma transport processes; Sparks; Spinning; Tellurium; Thermal conductivity; Thermoelectricity;

fLanguage

English

Publisher

ieee

Conference_Titel

Thermoelectrics, 2007. ICT 2007. 26th International Conference on

Conference_Location

Jeju Island

ISSN

1094-2734

Print_ISBN

978-1-4244-2262-3

Electronic_ISBN

1094-2734

Type

conf

DOI

10.1109/ICT.2007.4569414

Filename

4569414