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Influence of processing on stability, microstructure and thermoelectric properties of Ca3Co4 - (x)O9+delta
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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Number of Authors: 102018 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 38, no 4, p. 1592-1599Article in journal (Refereed) Published
Abstract [en]

Due to high figure of merit, Ca3Co4 - O-x(9) (+ delta) (CCO) has potential as p-type material for high-temperature thermoelectrics. Here, the influence of processing including solid state sintering, spark plasma sintering and post-calcination on stability, microstructure and thermoelectric properties is reported. By a new post-calcination approach, single-phase materials were obtained from precursors to final dense ceramics in one step. The highest zT of 0.11 was recorded at 800 degrees C for CCO with 98 and 72% relative densities. In situ high-temperature X-ray diffraction in air and oxygen revealed a higher stability of CCO in oxygen (similar to 970 degrees C) than in air (similar to 930 degrees C), with formation of Ca3Co2O6 which also showed high stability in oxygen, even at 1125 degrees C. Since achievement of phase pure high density CCO by post-calcination method in air is challenging, the phase stability of CCO in oxygen is important for understanding and further improvement of the method.

Place, publisher, year, edition, pages
2018. Vol. 38, no 4, p. 1592-1599
Keywords [en]
Ca3Co4 O--x(9) (+) (delta), Post calcination, Phase stability, Microstructure, Thermoelectric performance
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:su:diva-153584DOI: 10.1016/j.jeurceramsoc.2017.11.011ISI: 000424716700074OAI: oai:DiVA.org:su-153584DiVA, id: diva2:1190781
Available from: 2018-03-15 Created: 2018-03-15 Last updated: 2018-03-15Bibliographically approved

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