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Thermoelectric properties of the different phases of CuFe2O4 prepared by aerosol deposition

Title data

Stöcker, Thomas ; Dauner, Peter ; Moos, Ralf:
Thermoelectric properties of the different phases of CuFe2O4 prepared by aerosol deposition.
2015
Event: 90. DKG Jahrestagung / Symposium Hochleistungskeramik 2015 , 15.-19.03.2015 , Bayreuth, Deutschland.
(Conference item: Conference , Other Presentation type)

Abstract in another language

In this study, the thermoelectric properties of tetragonal and cubic CuFe2O4, a cuprospinel, were investigated. For this purpose, the cuprospinel was synthetized by a conventional mixed-oxide technique and calcined at 1000 °C. X-ray diffraction studies revealed that tetragonal CuFe2O4 arises when slowly cooling down the cuprospinel in a thermodynamic equilibrium. Given that the cubic system is the hightemperature phase of CuFe2O4, the calcined powder was quenched to roomtemperature in order to obtain cubic cuprospinel.

After conducting X-ray diffraction studies to verify the crystal structure of the synthesized cuprospinel, the novel Aerosol Deposition (AD) coating technique was employed to prepare ceramic films. This technology bases upon a room temperature impact consolidation process (RTIC) to deposit dense solid films of ceramic materials on various substrates without using a high-temperature step during the coating process. By employing this AD method, it was possible to obtain non-porous, dense ceramic films of 10 μm thickness, of both tetragonal and cubic CuFe2O4 at room temperature.

By using a modulation heater to impress an oscillating temperature gradient over the samples, the Seebeck coefficient and the electrical conductivity were measured between room-temperature and 800 °C. Our results indicate that tetragonal as well as cubic CuFe2O4 are p-type semiconductors at room temperature but apparently run through a phase-transition at 400 °C, resulting in a change of the conduction mechanism from p-type to n-type at high temperatures yet remaining n-type when cooling down to room temperature.
Since this mechanism hasn’t been observed for cuprospinel so far, this study helps to gain more knowledge of the thermoelectric properties of CuFe2O4.

Further data

Item Type: Conference item (Other)
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
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: 11 May 2015 09:53
Last Modified: 18 Apr 2016 07:09
URI: https://eref.uni-bayreuth.de/id/eprint/13157