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| Título: | Tailoring Ca3Co4O9 microstructure and performances using a transient liquid phase sintering additive |
Autor: | Sotelo, Andres CSIC ORCID; Costa, F. M.; Ferreira, N. M.; Amaral, Vitor S.; Amaral, J.S.; Rasekh, Sh.; Torres, M. A. CSIC ORCID ; Madre, M. A. CSIC ORCID; Diez, J. C. CSIC ORCID | Fecha de publicación: | 2016 | Editor: | Elsevier | Citación: | Journal of the European Ceramic Society 36(4): 1025-1032 (2016) | Resumen: | A flexible, adaptable, economical and easily scalable processing route, allowing microstructural control, is presented. It involves classical solid state sintering method and addition of liquid promoting compound. Controlled porosity and high thermoelectric performance have been attained in CaCoO by KCO additions, drastically improving the sintering procedure. KCO behaves as transient liquid phase, providing microstructural benefits, vanishing during sintering. Electrical resistivity was improved by enhanced grains connectivity and growth. Significant increase in Seebeck coefficient at high temperatures has been produced while lattice thermal conductivity was unaffected. The best ZT value, estimated at 800°C, assuming the thermal conductivity value at 140°C, is 0.35 for 5wt.% KCO samples. These values are significantly higher than that obtained in highly-dense textured materials at the same temperature. The results suggest that this approach is very effective for preparing highly-performing CaCoO-based thermoelectric materials with relatively high porosity to control thermal conductivity. | Descripción: | et al. | Versión del editor: | https://doi.org/10.1016/j.jeurceramsoc.2015.11.024 | URI: | http://hdl.handle.net/10261/148225 | DOI: | 10.1016/j.jeurceramsoc.2015.11.024 | Identificadores: | doi: 10.1016/j.jeurceramsoc.2015.11.024 e-issn: 1873-619X issn: 0955-2219 |
| Aparece en las colecciones: | (ICMA) Artículos |
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| sinteringadditive148225.pdf | 1,55 MB | Adobe PDF |  Visualizar/Abrir |
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