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Berlin 2012 – scientific programme

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SYRS: Symposium Resistive Switching

SYRS 2: Poster: Resistive switching (jointly organized by DS, DF, KR, HL)

SYRS 2.21: Poster

Thursday, March 29, 2012, 17:30–19:00, Poster E

Optimizing thermoelectric Properties: Microstructure Analysis of Ag1−xPb18Sb1+yTe20 — •Susanne Perlt1, Thomas Höche2, Jayaram Dadda3, and Eckhard Müller31Leibniz Institute of Surface Modification, Leipzig — 2Fraunhofer Institute for Mechanics of Materials, Halle — 3German Aerospace Center, Institute of Materials Research, Köln

The feasible recovery of waste-heat energy as it is generated by industrial and vehicle engines has led to increasing research interest in thermoelectrics (TE). In order to get TE materials with high performance, i.e. with a large figure of merit ZT, one needs to tune electronic and phononic properties. A promising candidate is the quaternary compound Ag1−xPb18Sb1+yTe20 (Lead-Antimony-Silver-Tellurium, LAST) for applications in the mid-temperature range. While the self-organized nanostructures assumed to act as phonon scatterers decrease the lattice thermal conductivity κL, the volume fraction of Sb and Ag and their ratio in the matrix have a significant influence on the electronic properties of the material. This study reports microstructure investigations at the micrometer and nanometer scale regarding SEM and TEM analysis, as well as measurements concerning TE properties. An attempt is made to derive a structure-property relationship.

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