Highly efficient bismuth telluride doped p-type Pb0.13Ge 0.87Te for thermoelectric applications

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Abstract

Bi2Te3 doped p-type Pb0.13Ge 0.87Te samples were prepared by hot pressing. We report on very high power factor values of ∼30 μW/cm K2 at 500 °C, as were determined from Seebeck coefficient and electrical resistivity measurements. From dila-tometric characterization, the phase transition from the low temperature rhombohedral to the high temperature cubic NaCl structures, takes place at 373 °C. This transition is accompanied by a continuous and gradual change of the lattice parameters, as was observed by hot stage XRD, suggesting a good mechanical durability upon thermal cycling and operating in large thermal gradients. Rhombohedral distortion of the cubic NaCl structure of Pb 1-xGexTe upon cooling, characterized by changes in the interaxial angle α and the lattice parameter.

Original languageEnglish
Pages (from-to)232-234
Number of pages3
JournalPhysica Status Solidi - Rapid Research Letters
Volume1
Issue number6
DOIs
StatePublished - 1 Dec 2007

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