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 2012 |
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ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
Cite this
Enhancement of thermoelectric figure of merit by the iNSERTION OF MgTe nanostructures In p -type PbTe doped with Na 2 Te. / Ohta, Michihiro; Biswas, Kanishka; Lo, Shih Han; He, Jiaqing; Chung, Duck Young; Dravid, Vinayak P.; Kanatzidis, Mercouri G.
In: Advanced Energy Materials, Vol. 2, No. 9, 09.2012, p. 1117-1123.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Enhancement of thermoelectric figure of merit by the iNSERTION OF MgTe nanostructures In p -type PbTe doped with Na 2 Te
AU - Ohta, Michihiro
AU - Biswas, Kanishka
AU - Lo, Shih Han
AU - He, Jiaqing
AU - Chung, Duck Young
AU - Dravid, Vinayak P.
AU - Kanatzidis, Mercouri G
PY - 2012/9
Y1 - 2012/9
N2 - 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.
AB - 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.
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U2 - 10.1002/aenm.201100756
DO - 10.1002/aenm.201100756
M3 - Article
VL - 2
SP - 1117
EP - 1123
JO - Advanced Energy Materials
JF - Advanced Energy Materials
SN - 1614-6832
IS - 9
ER -