Development of nanostructures in thermoelectric Pb-Te-Sb alloys
Abstract
In analogy to recent demonstrations of enhanced thermoelectric properties in superlattice materials, composite structures with nanoscale features promise dramatic improvements in the figure of merit of thermoelectric materials. Fabrication of nanostructured thermoelectric materials via bulk synthesis is an attractive route for commercial applications. Nanometer scale lamellae of PbTe and Sb_2 Te_3 form when quenched eutectic PbTe-Sb_2Te_3 melt is subsequently annealed. The lamellar spacing depends on the temperature and time of the anneal. The mechanism for the development of the nanostructures can be characterized by examining the fraction of material transformed as a function of anneal time. Preliminary analysis of the shape factor exponent reveals that the evolution of the nanostructured lamellae is likened to the thickening of very large plates. The coarsening of the lamellar spacing is also examined as a function of time.
Additional Information
© 2006 IEEE. Issue Date: 6-10 Aug. 2006. Date of Current Version March 19, 2007. This work was supported by the Office of Naval Research. LC was supported by the SURF program at Caltech.Attached Files
Published - Ikeda2006p9295Ict'06_Xxv_International_Conference_On_Thermoelectrics_Proceedings.pdf
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- Eprint ID
- 24275
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- CaltechAUTHORS:20110630-112442325
- Office of Naval Research (ONR)
- Caltech Summer Undergraduate Research Fellowship (SURF)
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2011-06-30Created from EPrint's datestamp field
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2021-11-09Created from EPrint's last_modified field
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- 9473851