Hanspeter Scherrer

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The present work is focus on thermoelectric materials synthesized by economical technique and less production time for low-cost thermoelectric module fabrication. Bi<sub>x</sub>Sb<sub>2-x</sub>Te<sub>3</sub> polycrystalline with x = 1.6 for n-type and x = 0.45 for p-type thermoelectric materials were synthesized using two different methods, hot pressing and(More)
This paper is devoted to a survey of the principal studies performed on Bi-Sb thermoelectric materials over the last forty years. Bi-Sb alloys are still the best n-type materials for refrigeration at low temperatures nowadays. After a brief introduction of their physical characteristics (crystallography and band structure), the elaboration, characterization(More)
The use of 2,5-disubstituted pyrimidine rings as a structural element in liquid crystals is well known. Monoand disubstituted diphenyl-pyrimidines have been studied mainly by Schubert et al. [1-3] and more recently various phenyl-pyrimidines have been prepared by Zaschke [4]. Only minor changes of the molecular geometry are expected when a phenyl group in a(More)
Bulk bismuth-silica nanocomposites have been prepared via powder metallurgy to study the influence of silica inclusions on the transport properties of Bi-based materials. Bi-SiO/sub 2/ ultrafine powders were produced by an arc-plasma processing. TEM investigations revealed the presence of a nanometric silica shell around each Bi grain. The nanocomposite(More)
The aim of the investigation is to attempt to build-up a p-n junction by means of utilizing conventional thermoelectric materials, i.e. bulk polycrystalline p-type Bi<sub>0.45</sub>Sb<sub>1.55</sub>Te<sub>3</sub> and n-type Bi<sub>1.6</sub>Sb<sub>0.4</sub>Te<sub>3</sub>. The fabrication used a rapid and ordinary sintering procedure. The current-voltage(More)
Electrical resistivity, thermoelectric power, thermal conductivity, and dimensionless figure of merit of the partially filled skutterudites CaxCo4Sb12, with x = 0, 0.03, 0.05, 0.08, and 0.20, have been studied in the low temperature range, from 4.2 to 300 K. The compounds have been prepared by a powder metallurgy route. We find that the insertion of Ca in(More)
New materials are being investigated for thermoelectric applications. Chevrel phases have an open lattice and should have low thermal conductivity. Thus they should be interesting for thermoelectric applications. We performed band structure calculations on several selenide compounds using the Korringa-Kohn-Rostoker method. TiMo/sub 6/Se/sub 8/ is found to(More)
PbTe thin films were prepared by pulsed laser deposition from a Nd:YAG laser (532 nm). The films were deposited onto glass substrates. Influence of deposition temperature (80-160/spl deg/C), fluence (5-13 J/cm/sup 2/) and nominal composition of the target on the chemical composition of the films was studied. It is found that the tellurium content of the(More)
We present experimental investigation of synthesis nanostructures of p-type Bi<inf>0.6</inf>Sb<inf>1.4</inf>Te<inf>3</inf> thermoelectric materials. These semiconductor materials are the best convention thermoelectric materials for use near room temperature. A new synthesis method of nanopowder using the laser ablation on high speed moving target and long(More)
The thermoelectric properties of PbTe/PbEuTe quantum wells are investigated theoretically employing a more realistic well model than it was used up to now. The carrier scattering both on optical and acoustical phonons is considered. The electrical conductivity and Seebeck coefficient are calculated using the variational method taking into account the(More)
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