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FP5

NANOTHERMEL Résumé de rapport

Project ID: G5RD-CT-2000-00292
Financé au titre de: FP5-GROWTH
Pays: United Kingdom

Evaluation of the thermoelectric transport properties of pure homogeneous Zn(4)Sb(3)

Electrical transport properties of high purity single crystal Zn(4)Sb(3) materials fabricated for the first time at UAA were evaluated at NEDO, Cardiff. Samples of Zn(4)Sb(3)were zone refined under various conditions at UAA and sent to DLR and NEDO for investigation.

Prior to slicing, Seebeck coefficient profiling along the crystal ingot was made in 2mm steps to investigate homogenity of the refined crystal. Seebeck and electrical conductivity were measured (at 300K), together with carrier concentration and Hall mobility. Results indicate an increase in Seebeck coefficient is due to reduction in carrier concentration in the second batch material. Electrical conductivity is also noted to increase in the second batch material.

Data is comparable to results published in the literature for this state-of-the-art material confirming that synthesis of this material by UAA is successful. Consolidated material will be manufactured from grinding these crystals and transport properties characterisation used to assess any increase in ZT after doping is implemented. Zn(4)Sb(3) is a state-of-the-art thermoelectric material and further increases in ZT would enable high performance thermoelectric devices using this technology to be developed within Europe.

More information on the NANOTHERMEL project can be found at: http://www.nanothermel.org

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Michael ROWE
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