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Powder-Aerosol deposited (PAD) calcium cobaltite as textured p-type thermoelectric material

Title data

Schönauer-Kamin, Daniela ; Bresch, Sophie ; Paulus, Daniel ; Moos, Ralf:
Powder-Aerosol deposited (PAD) calcium cobaltite as textured p-type thermoelectric material.
Event: 98. DKG-Jahrestagung , 27.03.-30.03.2023 , Jena.
(Conference item: Conference , Speech )

Abstract in another language

Oxide thermoelectric semiconducting materials like p-type calcium cobaltite Ca3Co4O9 are investigated as oxidation- and temperatureresistant thermoelectric materials for thermoelectric generators (TEGs). To realize TEGs in planar film technology, the powder aerosol deposition (PAD) method is emerging recently. PAD is a method to obtain dense ceramic films directly from the synthesized starting powders without a subsequent high-temperature step. In the present work, Ca3Co4O9 (CCO) powders are processed by PAD to ceramic films at room temperature. The thermoelectric properties of the films (film thickness 10 – 20 μm) are characterized from room temperature to 900°C. Additionally, the layer morphology and texture of the films will be investigated. As result, the Seebeck coefficient of the CCO-PAD film is very close to pressed and sintered CCO-bulk materials during the 1st heating cycle to 900°C. The morphology of the films after the thermal treatment shows strongly aligned crystallites resulting in a strong texture of the films. The electrical conductivity increases strongly during the 1st heating cycle to 900°C and remains almost constant afterwards. Compared to CCO-bulk materials, the films provide higher electrical conductivity which could be explained by the oriented crystal growth in-plane direction of the film. The relationship between thermoelectric properties and layer morphology as a function of thermal annealing parameters will be further investigated.

Further data

Item Type: Conference item (Speech)
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
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 11 Apr 2023 05:59
Last Modified: 11 Apr 2023 05:59