Spark plasma sintering of Ruddlesden–Popper Ca2−xDyxMnO4 ceramics: Impact on thermoelectric and mechanical performance

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2024-09-27 DOI:10.1111/jace.20158

Maroua Allani, Alexandre Bahezre, Ines Massoud, Fabien Giovannelli, Christel Laberty-Robert, Damien Bregiroux

引用次数: 0

Abstract

n-type Dy-doped Ca₂MnO₄ 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 Ca₂MnO₄, but the addition of Li₂O 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.

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Ruddlesden-Popper Ca2-xDyxMnO4 陶瓷的火花等离子烧结：对热电和机械性能的影响

通过燃烧法合成了具有 Ruddlesden-Popper 结构的 n 型掺钕 Ca2MnO4 粉末，并通过传统烧结法和火花等离子体烧结法（SPS）进行了烧结。传统烧结法无法使 Ca2MnO4 变致密，但事实证明添加 Li2O 是一种非常有效的烧结添加剂，尽管会对导电性产生不利影响。相比之下，在 850°C 的温度下进行 1 分钟的 SPS 可得到纳米结构、几乎完全致密的样品，显示出卓越的效果。在 750°C 时，无量纲优度 ZT 达到 0.02。此外，最佳样品的硬度值高达 10.7 GPa，凸显了这种创新方法所获得的优异机械性能。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

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