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

Titelangaben

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. Bd. 44 (2024) Heft 15 . - 116717.
ISSN 0955-2219
DOI: https://doi.org/10.1016/j.jeurceramsoc.2024.116717

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Abstract

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.