Regensburg 2013 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 18: Nanostructured oxide thermoelectrics

DF 18.1: Vortrag

Mittwoch, 13. März 2013, 12:30–12:50, H9

Thermoelectric properties of p-type Bi₂Sr₂Co₂O₉ glass-ceramics — •Matthias Jost^1,3, Julian Lingner^1,2, Martin Letz², and Gerhard Jakob¹ — ¹Johannes-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, BiSrCo₂O_x 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 700^∘C. A characterization of the thermoelectric properties leads to values of ZT between 0.008 and 0.018.