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Effect of Oxygen Partial Pressure on the Phase Stability of Copper-Iron Delafossites at Elevated Temperatures

DOI zum Zitieren dieses Dokuments: https://doi.org/10.3390/ma11101888
URN to cite this document: urn:nbn:de:bvb:703-epub-4262-7

Title data

Stöcker, Thomas ; Moos, Ralf:
Effect of Oxygen Partial Pressure on the Phase Stability of Copper-Iron Delafossites at Elevated Temperatures.
In: Materials. Vol. 11 (October 2018) Issue 10 . - No. 1888.
ISSN 1996-1944
DOI: https://doi.org/10.3390/ma11101888

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Abstract

Oxide-based materials are promising candidates for use in high temperature thermoelectric generators. While their thermoelectric performance is inferior to commonly used thermoelectrics, oxides are environmentally friendly and cost-effective. In this study, Cu-based delafossites (CuFeO2), a material class with promising thermoelectric properties at high temperatures, were investigated. This work focuses on the phase stability of CuFeO2 with respect to the temperature and the oxygen partial pressure. For this reason, classical material characterization methods, such as scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction, were combined in order to elucidate the phase composition of delafossites at 900 °C at various oxygen partial pressures. The experimentally obtained results are supported by the theoretical calculation of the Ellingham diagram of the copper–oxygen system. In addition, hot-stage X-ray diffraction and long-term annealing tests of CuFeO2 were performed in order to obtain a holistic review of the phase stability of delafossites at high temperatures and varying oxygen partial pressure. The results support the thermoelectric measurements in previous publications and provide a process window for the use of CuFeO2 in thermoelectric generators.

Further data

Item Type: Article in a journal
Additional notes (visible to public): Special Issue Advanced Thermoelectric Materials
Keywords: delafossite; Ellingham diagram; phase stability; high temperature thermoelectric materials; thermoelectric generator (TEG)
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
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
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Units
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-4262-7
Date Deposited: 04 Mar 2019 10:38
Last Modified: 04 Mar 2019 10:38
URI: https://epub.uni-bayreuth.de/id/eprint/4262

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