Journal
ADVANCED ENERGY MATERIALS
Volume 2, Issue 9, Pages 1117-1123Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201100756
Keywords
lead telluride; nanoprecipitates; electrical transport properties; thermal conductivity; thermoelectrics
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Funding
- Revolutionary Materials for Solid State Energy Conversion, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001054]
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation
- State of Illinois
- Northwestern University
- Department of Energy, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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The thermoelectric properties of crystalline melt-grown ingots of p-type PbTexMgTe (x = 13 mol%) doped with Na2Te (12 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 significantly reducing the lattice thermal conductivity. A ZT of 1.6 at 780 K is achieved for the PbTe containing 2% MgTe doped with 2% Na2Te.
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