Powder aerosol deposited calcium cobaltite as textured P-type thermoelectric material with power factors approaching single crystal values

Title data

Paulus, Daniel ; Bresch, Sophie ; Moos, Ralf ; Schönauer-Kamin, Daniela:
Powder aerosol deposited calcium cobaltite as textured P-type thermoelectric material with power factors approaching single crystal values.
In: Journal of the European Ceramic Society. Vol. 44 (2024) Issue 15 . - 116717.
ISSN 0955-2219
DOI: https://doi.org/10.1016/j.jeurceramsoc.2024.116717

Official URL:

Abstract in another language

In this work, the thermoelectric material calcium cobaltite Ca3Co4O9 (CCO), a promising p-type conducting thermoelectric oxide with anisotropic properties, was processed by the powder aerosol deposition method (PAD) to form a dense ceramic CCO film with a thickness in the µm range. The prepared films were characterized regarding their microstructure and thermoelectric properties between room temperature and 900 °C. After heat treatment at 900 °C, the CCO PAD film in-plane shows excellent properties in terms of electrical conductivity (280 S/cm at 900 °C) and Seebeck coefficient (220 µV/K at 900 °C). The calculated power factor in-plane (ab) reaches with 1125 µW/(m K²) 40 % of the single crystal value, surpassing the known-properties of CCO bulk ceramics. Examination of the microstructure shows a strong fiber texture of the film as well as a strong coarsening of the grains during the first heat treatment up to 900 °C.

Further data

Item Type:	Article in a journal
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 > Central research institutes > 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:	23 Jul 2024 09:11
Last Modified:	23 Jul 2024 09:11
URI:	https://eref.uni-bayreuth.de/id/eprint/90027