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 - 2012/9/1
Y1 - 2012/9/1
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
AN - SCOPUS:84867320186
VL - 2
SP - 1117
EP - 1123
JO - Advanced Energy Materials
JF - Advanced Energy Materials
SN - 1614-6832
IS - 9
ER -