Thermoelectric properties of p-type half-Heusler alloys Zr1−xTixCoSnySb1−y (0.0<x<0.5; y=0.15 and 0.3)

V. Ponnambalam,Paola N. Alboni,Justine Edwards,Terry M. Tritt,Slade Roland Culp,S. Joseph Poon

Thermoelectric properties of p-type half-Heusler alloys Zr1−xTixCoSnySb1−y (0.0<x<0.5; y=0.15 and 0.3)

2008

Half-Heusler alloys Zr1−xTixCoSnySb1−y (0.0thermoelectric materials. In these p-type materials, the Zr site is primarily substituted with Ti to reduce thermal conductivity (κ), while the Sn content is varied to optimize thermoelectric properties. For these compositions, these alloys exhibit moderate resistivity (ρ) in the mΩcm range and high positive thermopower (α), on the order of hundreds of μV∕K. Measured Hall coefficients suggest that holes are dominant charge carriers. Calculated carrier mobilities are rather low in the range of 0.8–1.5cm2∕Vs. Thermal conductivity (κ) values as low as ∼8.5–4.5Wm−1K−1 are also measured. The calculated thermoelectric figure of merit ZT=α2T∕ρκ is as high as 0.2 at T=1000K, implying that these alloys could be potential p-type thermoelectric materials for energy conversion at high temperatures.

Keywords:

Correction
Source
Cite
Save
Machine Reading By IdeaReader

References

Citations