Effect of annealing treatment on thermoelectric properties of n-type Bi-Te-Se sintered materials

Author

Jiang, Jun ; Li, Yali ; Xu, Gaojie ; Cui, Ping ; Chen, Lidong

Author_Institution

Ningbo Inst. of Mater. Technol. & Eng., Chinese Acad. of Sci., Ningbo

fYear

2007

fDate

3-7 June 2007

Firstpage

64

Lastpage

66

Abstract

In this study, n-type Bi-Te-Se crystals were prepared by the zone melting (ZM) method and bulk materials with high bending strength were fabricated by ZM followed by spark plasma sintering (SPS) technique. The annealing treatment was then carried out at 593 K with holding time of 36 hr for the sintered materials. Thermoelectric properties, including Seebeck coefficient (alpha), electrical conductivity (sigma) and thermal conductivity (kappa) were measured in the temperature range of 300-500 K. The results showed the maximum figure of merit (ZT = alpha²sigmaT/kappa) of 0.79 was obtained for the n-type Bi-Te-Se material through the annealing treatment, which was very close to that of the zone-melted crystal.

Keywords

Seebeck effect; annealing; bending strength; bismuth alloys; crystal growth from melt; electrical conductivity; plasma materials processing; selenium alloys; sintering; tellurium alloys; thermal conductivity; zone melting; BiSeTe; Seebeck coefficient; annealing; bending strength; bulk materials; electrical conductivity; n-type sintered crystals; spark plasma sintering; temperature 300 K to 500 K; temperature 593 K; thermal conductivity; thermoelectric property; time 36 hr; zone melting; Annealing; Conducting materials; Crystalline materials; Crystals; Plasma measurements; Plasma temperature; Sparks; Temperature measurement; 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.2007.4569424

Filename

4569424