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High temperature thermoelectric properties of PbTe prepared by high pressure method

Fan H., Su T., Li H., Zeng Y., Li S., Hu M., Ma H., Jia X.

Materials Science Poland

2015

Vol. 33, No. 1

152--156

Thermoelectric materials PbTe were synthesized by high pressure method. The microstructure and temperature dependence of thermoelectric properties were studied. Some second phases with nano-structure were found in the high pressure synthesized samples. Compared with that of PbTe prepared at an atmospheric pressure, the samples prepared by high pressure method had smaller grain sizes, lower resistivity and lower phonon thermal conductivity. The maximum figure of merit, Z reached 8.86 × 104 K1 for the sample prepared at 4 GPa. This value was about twice times higher than that of the sample prepared at ambient pressure and it matched to that of highly doped PbTe.

Comparison of thermoelectric properties of polycrystalline and sintered PbTe doped with chromium and iodine

Królicka A., Hruban A., Materna A., Piersa M., Strzelecka S., Dalecki W., Romaniec M., Orliński K.

Materiały Elektroniczne

2014

T. 42, nr 1

5--12

In this paper we compare the electrical and thermoelectric properties of polycrystalline PbTe doped with chromium and iodine, obtained by the Bridgman method and the sintered material obtained following the powder processing procedure. The highest values of the Seebeck coefficient for the polycrystalline and sintered material are as follows: - 160 μV/K (T = 675 K) and - 311 μV/K (T = 573 K), respectively, thus indicating a significant improvement in the thermoelectric properties of the sintered material. The studies of the influence of the powder particle size on the properties of the sintered material were carried out.

W artykule przedstawiono porównanie własności elektrycznych i termoelektrycznych polikrystalicznego tellurku ołowiu domieszkowanego chromem i jodem, otrzymanego za pomocą metody Bridgmana z własnościami materiału spiekanego otrzymanego z proszków. Najwyższe wartości współczynnika Seebecka polikrystalicznego materiału i materiału po spiekaniu wynoszą odpowiednio: - 160 μV/K (T = 675 K) oraz - 310 μV/K (T = 573 K) i wskazują na znaczną poprawę parametrów termoelektrycznych materiału otrzymanego w wyniku spiekania. Przeprowadzono badania wpływu wielkości ziaren proszku na własności materiału spiekanego.

PbTe constrictions for spin filtering

Grabecki G.

Materials Science Poland

2006

Vol. 24, No. 3

591--598

The present article is a review of our experimental works performed on PbTe nanostructures. An uniqueness of lead telluride relies on combination of excellent semiconducting properties, like high electron mobility and tunable carrier concentration, with paraelectric behavior leading to huge dielectric constant at low temperatures. For nanostructured constrictions of PbTe we have observed 1-dimensional quantization of electron motion at much more impure conditions than in any other system studied so far. This is possible due to dielectric screening of Coulomb potential fluctuations produced by various defects usually existing in the solid state environment. In an external magnetic field, the quantization shows very pronounced spin splitting, already discernible at several kilogauss. This indicates that PbTe nanostructures are very promising as local spin-filtering devices.