Dresden 2014 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 9: Poster Session DF
DF 9.15: Poster
Dienstag, 1. April 2014, 18:30–20:00, P1
Thermoelectric oxides in glass-ceramic materials — •Julian Lingner1,2, Gerhard Jakob1, and Martin Letz2 — 1Johannes Gutenberg-Universität Mainz — 2Schott AG Mainz
Energy demand worldwide is a central topic which motivates the research in the field of conversion materials. Within this area, thermoelectric materials have received wide attention in the last 20 years and some major improvements have been made in order to tune their efficiency. Material classes like silicides, half-heusler compunds or oxides are currently under investigation with individual advantages and disadvantages. Materials that withstand high temperatures above 500°C are especially in great demand since the thermoelectric conversion efficiency is proportional to the applied temperature difference so that the potential fields of application are extended. Due to the requirement paired with environmental regulations it is very important to find materials which operate in these temperature regions while at the same time being naturally abundant and non-toxic. This presentation shows two unconventional glass-ceramic systems which contain thermoelectric active crystalline regions. Starting from a base glass system, a thermoelectric crystal structure is embedded in the glass-matrix via a controlled thermal treatment. This leads 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. The preparation and results of thermoelectric measurements on different glass-ceramic systems are presented.