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Regensburg 2013 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 18: Nanostructured oxide thermoelectrics

DF 18.1: Talk

Wednesday, March 13, 2013, 12:30–12:50, H9

Thermoelectric properties of p-type Bi2Sr2Co2O9 glass-ceramics — •Matthias Jost1,3, Julian Lingner1,2, Martin Letz2, and Gerhard Jakob11Johannes-Gutenberg Univeristät, Institut für Physik, Staudinger Weg 7, Mainz D-55128 — 2Schott AG, Hattenbergstraße 10, Mainz D-55122 — 3Technische Universität Darmstadt, Institut für Mikrowellentechnik und Photonik, Merckstraße 25, Darmstadt D-64283

In the oxide system of Bi-Sr-Co glass melts were prepared by adding a small amount of glass formers. A crystallization leads to crystalline phases of Bi8Sr8Co4O25, BiSrCo2Ox and Bi2Sr2Co2O9 (BC-222) densely embedded into a residual glass phase. We show that it is possible via such glass-ceramic approach to obtain microstructured bulk material with low thermal conductivity and relatively high electrical conductivity. We further show that these materials are stable under thermal cycling for temperatures up to 700C. A characterization of the thermoelectric properties leads to values of ZT between 0.008 and 0.018.

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