Berlin 2012 – scientific programme
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DS: Fachverband Dünne Schichten
DS 42: Thermoelectric materials IV: Glass, sintered materials (Focused session – Organizers: Meyer, Heiliger)
DS 42.2: Talk
Friday, March 30, 2012, 12:00–12:15, H 2032
Glass-ceramics as high-temperature thermoelectric materials — •Julian Lingner1,2, Matthias Jost1,2, Gerhard Jakob1, and Martin Letz2 — 1Johannes Gutenberg-Universität Mainz — 2Schott AG Mainz
The research on thermoelectric materials has progressed enormously over the last years and is still growing because of the global demand for eco-sensitive energy conversion. Innovative approaches like bulk-nanostructuring helped to increase the efficiency of the investigated materials. Especially the high temperature segment of thermoelectric materials seems to promise good yields concerning power generation because the efficiency is proportional to the temperature. Therefore it is important to find suitable materials in this regime. SiGe has been known to be a high-temperature thermoeletric but has the limited availability of Ge as a big disadvantage. This presentation focuses on a new material class for high temperatures in thermoelectrics - glass-ceramics. In a glass-ceramic, a certain crystal structure is embedded in a glass-matrix leading to many new properties of the material. Especially the possibility to induce small crystallites, the pore-free surface combined with the high-temperature durability of this material class support this approach. Measurements of different systems of glass-ceramic thermoelectric materials are presented.