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Thermoelectric properties of p-type Fe-doped TiCoSb half-Heusler compounds.
- Source :
- Journal of Applied Physics; Nov2007, Vol. 102 Issue 10, p103705, 5p, 2 Diagrams, 1 Chart, 7 Graphs
- Publication Year :
- 2007
-
Abstract
- TiFe<subscript>x</subscript>Co<subscript>1-x</subscript>Sb half-Heusler materials with randomly distributed TiO<subscript>2</subscript> particles have been synthesized by arc melting and annealing. Thermoelectric properties were measured in the temperature range of ∼300–850 K. TiCoSb shows n-type conduction, while TiFe<subscript>x</subscript>Co<subscript>1-x</subscript>Sb transfers to p-type conduction when x≥0.01. The electrical conductivity of p-type TiFe<subscript>x</subscript>Co<subscript>1-x</subscript>Sb increased with increasing Fe content. The maximum Seebeck coefficient reached about 300 μV/K at 850 K for x=0.15. Since Fe powder contained a trace of Fe<subscript>2</subscript>O<subscript>3</subscript>, a small amount of TiO<subscript>2</subscript> particles formed during the synthesis process. The lattice thermal conductivity dramatically decreased with increasing Fe content, which was mostly caused by the introduction of in situ formed TiO<subscript>2</subscript> particles, as well as the effects of mass fluctuation and strain field fluctuation due to the substitution of Fe to the Co site. The dimensionless figure of merit (ZT=S<superscript>2</superscript>σT/κ) was significantly improved over the whole temperature region, and a maximum ZT value of 0.45 has been obtained for the composition of TiFe<subscript>0.15</subscript>Co<subscript>0.85</subscript>Sb at 850 K. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 102
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 27709270
- Full Text :
- https://doi.org/10.1063/1.2809377