Thermoelectric properties of calcium silicides

Author

Imamura, Yasushi ; Muta, Hiroaki ; Kurosaki, Ken ; Yamanaka, Shinsuke

Author_Institution

Div. of Sustainable Energy & Environ. Eng., Osaka Univ., Suita

fYear

2006

fDate

6-10 Aug. 2006

Firstpage

535

Lastpage

538

Abstract

We investigated the thermoelectric properties of CaSi, Ca₅Si₃ and Ca₂Si. Polycrystalline CaSi and Ca ₅Si₃ were prepared by spark plasma sintering (SPS) technique. Polycrystalline Ca₂Si was prepared by an interdiffusion process. The electrical resistivity, Seebeck coefficient, and thermal conductivity for CaSi and Ca₅Si₃ were measured from room temperature to approximately 1000 K. Then, the figure of merit was evaluated by using these values. The temperature dependence of the electrical properties for CaSi and Ca₅Si₃ showed metallic behavior in all temperature range. CaSi showed n-type conduction and Ca₅Si₃ showed p-type conduction. The evaluated maximum dimensionless figure of merit for CaSi and Ca₅Si₃ are 5.1 times 10^-3 at 950 K and 0.11 at 50 K, respectively

Keywords

Seebeck effect; calcium compounds; chemical interdiffusion; electrical resistivity; semiconductor materials; silicon compounds; sintering; thermal conductivity; 50 K; 950 K; Ca₂Si; Ca₅Si₃; CaSi; Seebeck coefficient; calcium silicides; electrical resistivity; interdiffusion process; merit figure; n-type conduction; p-type conduction; spark plasma sintering technique; thermal conductivity; thermoelectric property; Calcium; Plasma measurements; Plasma properties; Plasma temperature; Silicides; Sparks; Temperature dependence; Temperature measurement; Thermal conductivity; Thermoelectricity;

fLanguage

English

Publisher

ieee

Conference_Titel

Thermoelectrics, 2006. ICT '06. 25th International Conference on

Conference_Location

Vienna

ISSN

1094-2734

Print_ISBN

1-4244-0810-5

Electronic_ISBN

1094-2734

Type

conf

DOI

10.1109/ICT.2006.331351

Filename

4133348