Entity

Time filter

Source Type


Schmitz A.,Institute of Materials ResearchGerman Aerospace CenterLinder Hoehe51147KolnGermany | Schmid C.,Institute of Materials ResearchGerman Aerospace CenterLinder Hoehe51147KolnGermany | Stiewe C.,Institute of Materials ResearchGerman Aerospace CenterLinder Hoehe51147KolnGermany | de Boor J.,Institute of Materials ResearchGerman Aerospace CenterLinder Hoehe51147KolnGermany | Muller E.,Institute for Inorganic and Analytical ChemistryJustus Liebig UniversityHeinrich Buff Ring 5835392GiessenGermany
Physica Status Solidi (A) Applications and Materials Science | Year: 2015

Skutterudites on the basis of CoSb3 are among the best thermoelectric materials for generator applications in the intermediate temperature range. Still, to be suitable for a wide range of applications methods for low cost fabrication of large amounts of this material are needed. A process potentially fulfilling these requirements is gas atomization plus consecutive short-term sintering. As the powder produced by atomization is usually not single phase skutterudite material, the subsequent processes of sintering and eventually annealing prior to sintering play an important role for the resulting material's thermoelectric properties. In this work, we investigate the influence of powder annealing and sintering on the properties of indium-filled skutterudites synthesized by gas atomization. The phase composition and thermoelectric properties are investigated as functions of the sintering temperature. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Falkenbach O.,Institute for Inorganic and Analytical ChemistryJustus Liebig UniversityHeinrich Buff Ring 5835392GiessenGermany | Tinz J.,Institute for Inorganic and Analytical ChemistryJustus Liebig UniversityHeinrich Buff Ring 5835392GiessenGermany | Schulze A.S.,Institute for Inorganic and Analytical ChemistryJustus Liebig UniversityHeinrich Buff Ring 5835392GiessenGermany | Mueller E.,Institute for Inorganic and Analytical ChemistryJustus Liebig UniversityHeinrich Buff Ring 5835392GiessenGermany | Schlecht S.,Institute for Inorganic and Analytical ChemistryJustus Liebig UniversityHeinrich Buff Ring 5835392GiessenGermany
Physica Status Solidi (A) Applications and Materials Science | Year: 2015

Containing two environmentally friendly elements, tin monosulfide (SnS) is considered to be a possible candidate for sustainable thermoelectrics in the medium temperature range. Nanostructured SnS was synthesized via mechanical alloying and a solvothermal method. Two different ways for compacting of the nanopowders were applied, cold pressing and hot pressing, yielding similar results. A maximum ZT value of 0.075 at 773K was obtained, independently from the preparation procedures. In order to improve the thermoelectric properties, mechanically alloyed SnS was doped with copper, silver, palladium, and platinum. Using silver as dopant, the efficiency could be doubled, while a tin substitution with the other elements did barely affect the thermoelectric transport. A comparison to single crystalline SnS reveals a reduced thermal conductivity through nanostructuring. The structure of the products was examined via X-ray diffraction (XRD) and transmission electron microscopy (TEM) showing a nanoscopic character with slightly varying lattice constants. In the case of larger sized impurity atoms secondary phases occur, indicating the solubility limits were reached and only partial incorporation of the added dopant amount into the matrix took place. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Discover hidden collaborations