Spark plasma sintering of Ruddlesden–Popper Ca <sub>2−</sub> <i> <sub>x</sub> </i> Dy <i> <sub>x</sub> </i> MnO <sub>4</sub> ceramics: Impact on thermoelectric and mechanical performance
Abstract n ‐type Dy‐doped Ca 2 MnO 4 powders with the Ruddlesden–Popper structure were synthesized by the combustion method and sintered by conventional sintering and spark plasma sintering (SPS). Conventional sintering fails to densify Ca 2 MnO 4 , but the addition of Li 2 O proves to be a highly effective sintering additive, albeit with a detrimental impact on electrical conductivity. In contrast, SPS at 850°C for 1 min yields nanostructured, nearly fully dense samples, demonstrating superior outcomes. The dimensionless figure of merit ZT reaches 0.02 at 750°C. Additionally, the best sample exhibits a remarkable hardness value of 10.7 GPa, underlining the excellent mechanical properties achieved through this innovative approach.
Authors
- Fabien Giovannelli (ORCID: https://orcid.org/0000-0003-1248-077X)
- Christel Laberty‐Robert (ORCID: https://orcid.org/0000-0003-3230-3164)
- M. Allani (ORCID: https://orcid.org/0000-0001-6232-4308)
- Damien Brégiroux (ORCID: https://orcid.org/0000-0002-5650-027X)
- Alexandre Bahezre
- Ines Massoud
Institutions
- Université de Tours (FR)
- Centre National de la Recherche Scientifique (FR)
- Sorbonne Université (FR)
- Chimie de la Matière Condensée de Paris (FR)
- Services déconcentrés d'appui à la recherche Val de Loire (FR)
- Institut National des Sciences Appliquées Centre Val de Loire (FR)
Publication Details
- Journal
- Journal of the American Ceramic Society
- Published
- 2024-09-27
- DOI
- https://doi.org/10.1111/jace.20158
- Citations
- 1
- Primary Topic
- Advanced Thermoelectric Materials and Devices
- Type
- article
- Field-Weighted Citation Impact
- 0.12
Funders
- Centre National de la Recherche Scientifique
- Sorbonne Université