Thermoelectric and thermophysical properties of TiCoSb, ZrCoSb, HfCoSb prepared by SPS

Author

Sekimoto, T. ; Kurosaki, K. ; Muta, H. ; Yama, S.

Author_Institution

Graduate Sch. of Eng., Osaka Univ., Japan

fYear

2005

fDate

19-23 June 2005

Firstpage

347

Lastpage

350

Abstract

Half-Heusler compounds TiCoSb, ZrCoSb, HfCoSb were prepared by a spark plasma sintering (SFS) technique. Their thermoelectric and thermophysical properties were measured. The band gap energy estimated from the electrical resistivity becomes small in the following order: TiCoSb (0.16 and 0.40 eV), ZrCoSb (0.14 eV), HfCoSb (0.07 eV). The largest thermoelectric power is obtained as -304 μV/K at 641 K for TiCoSb. The thermal conductivity and Debye temperature become small in the following order: TiCoSb, ZrCoSb, Hi7CoSb. The contribution to the thermal conductivity is mainly due to the lattice contribution. The maximum value of ZT is 0.020 at 986 K for ZrCoSb.

Keywords

Debye temperature; cobalt compounds; electrical resistivity; energy gap; hafnium compounds; sintering; thermal conductivity; thermoelectric power; titanium compounds; zirconium compounds; 641 K; 986 K; Debye temperature; Half-Heusler compounds; HfCoSb; TiCoSb; ZrCoSb; band gap energy; electrical resistivity; spark plasma sintering; thermal conductivity; thermoelectric power; thermophysical properties; Annealing; Atmosphere; Atmospheric measurements; Density measurement; Electric resistance; Plasma temperature; Thermal conductivity; Thermal resistance; Thermoelectricity; Ultrasonic variables measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Thermoelectrics, 2005. ICT 2005. 24th International Conference on

ISSN

1094-2734

Print_ISBN

0-7803-9552-2

Type

conf

DOI

10.1109/ICT.2005.1519955

Filename

1519955