Abstract
The thermoelectric properties of crystalline melt-grown ingots of p -type PbTe- x MgTe ( x = 1-3 mol%) doped with Na 2 Te (1-2 mol%) were investigated over the temperature range of 300 K to 810 K. While the powder X-ray diffraction patterns show that all samples crystallize in the NaCl-type structure with no MgTe or other phases present, transmission electron microscopy reveals ubiquitous MgTe nanoprecipitates in the PbTe. The very small amounts of MgTe in PbTe have only a small effect on the electrical transport properties of the system, while they have a large effect on thermal transport signifi cantly reducing the lattice thermal conductivity. A ZT of 1.6 at 780 K is achieved for the PbTe containing 2% MgTe doped with 2% Na 2 Te.
| Original language | English |
|---|---|
| Pages (from-to) | 1117-1123 |
| Number of pages | 7 |
| Journal | Advanced Energy Materials |
| Volume | 2 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sep 1 2012 |
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
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Ohta, M., Biswas, K., Lo, S. H., He, J., Chung, D. Y., Dravid, V. P., & Kanatzidis, M. G. (2012). Enhancement of thermoelectric figure of merit by the iNSERTION OF MgTe nanostructures In p -type PbTe doped with Na 2 Te. Advanced Energy Materials, 2(9), 1117-1123. https://doi.org/10.1002/aenm.201100756