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Defect chemistry and thermoelectric properties of doped Delafossite-type oxide CuFeO2

Title data

Stöcker, Thomas ; Moos, Ralf ; Rüger, Reinhold:
Defect chemistry and thermoelectric properties of doped Delafossite-type oxide CuFeO2.
Event: 2nd International Conference on Materials for Energy, EnMat II , 12.-16.05.2013 , Karlsruhe, Germany.
(Conference item: Conference , Poster )

Project information

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Project's official title
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No information

Project financing: Bundesministerium für Bildung und Forschung

Abstract in another language

In the field of thermoelectric energy conversion, oxide materials show a promising potential due to their good stability in oxidizing environments. Delafossite materials exhibit a good thermoelectric performance as p-type as well as n-type oxide semiconductors at elevated temperatures and can be doped with various transition metals by solid-state mixed oxide routes. Cu-based Delafossite oxides were synthetized by a conventional mixed-oxide technique with varying Ni- and Sn-content. The so prepared specimens were fired in oxygen-rich atmospheres with changing oxygen partial pressures. X-ray diffraction studies were conducted to determine the crystal structures of the doped Delafossites. By using a modulation heater to impress an oscillating temperature gradient over the samples, the thermopower was investigated between 300 K and 1100 K under defined oxygen partial pressures. In order to evaluate the thermoelectric conversion performance, quantified by the dimensionless figure of merit ZT, the electrical and the thermal conductivities were also measured. In addition, the electrical conductivity and the Seebeck coefficient were recorded as a function of the oxygen partial pressure to determine defect chemical constants in order to develop the basics of a defect chemical model of Cu-based Delafossites.

Further data

Item Type: Conference item (Poster)
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 18 May 2015 07:03
Last Modified: 14 Apr 2016 07:55