Thermoelectric properties of hot‐pressed Ruddlesden‐Popper phases CaO(CaMnO3)m

We investigated the Ruddlesden‐Popper series CaO(CaMnO3)m with m = 1, 2, 3, ∞, to study the impact of the varying amounts of CaO layers on their thermoelectric properties. Previous studies showed that highly dense samples are difficult to obtain due to the refractory nature of these materials. In th...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2023-10, Vol.106 (10), p.6098-6105
Main Authors: Shi, Yixuan, Sepahi, Zahra, Macario, Leilane R., Sturm, Cheryl, Mashmoushi, Nour, Amouyal, Yaron, Kleinke, Holger
Format: Article
Language:English
Subjects:
Ball milling
Crystallites
Electrical resistivity
oxides
Perovskites
Pressing
Ruddlesden‐Popper phases
Seebeck effect
semiconductors
Thermal conductivity
thermoelectric materials
Thermoelectricity
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Summary:We investigated the Ruddlesden‐Popper series CaO(CaMnO3)m with m = 1, 2, 3, ∞, to study the impact of the varying amounts of CaO layers on their thermoelectric properties. Previous studies showed that highly dense samples are difficult to obtain due to the refractory nature of these materials. In this study, we managed to obtain dense pellets during a classical hot‐pressing step, if and only if the samples were subjected to extended ball‐milling prior to pressing, resulting in crystallite sizes of 30–35 nm after hot‐pressing. The sample with the largest amount of CaO layers (m = 1) had the lowest electrical and thermal conductivity, and the highest Seebeck coefficient, as predicted. Ultimately the perovskite CaMnO3 (m = ∞, no CaO layers) exhibited the best thermoelectric properties.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.19221