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Structure and thermoelectric properties of nanocomposite bismuth telluride prepared by melt spinning or by partially alloying with IV-VI compounds

: Ebling, D.G.; Jacquot, A.; Jägle, M.; Böttner, H.; Kühn, U.; Kirste, L.


Physica status solidi. Rapid research letters 1 (2007), No.6, pp.238-240
ISSN: 1862-6254
ISSN: 1862-6270
Journal Article
Fraunhofer IPM ()
Fraunhofer IAF ()

Bismuth telluride samples are compared with respect to the evolution of their thermoelectric material parameters like thermal and electrical conductivity. The Seebeck coefficient is discussed in dependence on the melt spinning fabrication technique. The melt spinner used is only able to produce small thin ribbon shaped specimens, some as thin as 10 m. This limits melt spinning to mainly production of research specimens for alloys with high critical cooling rate, which are difficult to fabricate with other techniques. Additional parameters are alloying or doping of the base material by comparing the properties as prepared to different annealing conditions. The intrinsic p- and n-doped material was alloyed with u p to 0.5% lead telluride by rapidly cooling the bulk material to improve the thermoelectric properties analysed from RT up to about 600 K. A Seebeck coefficient of well above 200 µV/K could be obtained for p- and n-type materials.