Enhancing electrical properties in CaMnO3-based ceramics: The impact of single doping with different elements

This study explores the effect of single doping with different rare earth elements (Y, La, and Yb) on the structural, morphological and electrical properties of CaMnO3 bulk ceramics, aiming to improve their thermoelectric performance. Ca(1-x)RxMnO3 (R = Y, La, Yb; x = 0, 0.05, 0.10) samples were syn...

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Autores: Amirkhizi, Parisa, Madre, M. A., Constantinescu, Gabriel, Torres, M. A., Sotelo, Andres, Kovalevsky, Andrei V., Rasekh, Shahed
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2025
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/389983
Acesso em linha:http://hdl.handle.net/10261/389983
Access Level:acceso abierto
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dc.title.none.fl_str_mv Enhancing electrical properties in CaMnO3-based ceramics: The impact of single doping with different elements
title Enhancing electrical properties in CaMnO3-based ceramics: The impact of single doping with different elements
spellingShingle Enhancing electrical properties in CaMnO3-based ceramics: The impact of single doping with different elements
Amirkhizi, Parisa
title_short Enhancing electrical properties in CaMnO3-based ceramics: The impact of single doping with different elements
title_full Enhancing electrical properties in CaMnO3-based ceramics: The impact of single doping with different elements
title_fullStr Enhancing electrical properties in CaMnO3-based ceramics: The impact of single doping with different elements
title_full_unstemmed Enhancing electrical properties in CaMnO3-based ceramics: The impact of single doping with different elements
title_sort Enhancing electrical properties in CaMnO3-based ceramics: The impact of single doping with different elements
dc.creator.none.fl_str_mv Amirkhizi, Parisa
Madre, M. A.
Constantinescu, Gabriel
Torres, M. A.
Sotelo, Andres
Kovalevsky, Andrei V.
Rasekh, Shahed
author Amirkhizi, Parisa
author_facet Amirkhizi, Parisa
Madre, M. A.
Constantinescu, Gabriel
Torres, M. A.
Sotelo, Andres
Kovalevsky, Andrei V.
Rasekh, Shahed
author_role author
author2 Madre, M. A.
Constantinescu, Gabriel
Torres, M. A.
Sotelo, Andres
Kovalevsky, Andrei V.
Rasekh, Shahed
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Gobierno de Aragón
Fundação para a Ciência e a Tecnologia (Portugal)
Ministério da Ciência, Tecnologia e Ensino Superior (Portugal)
European Commission
Agencia Estatal de Investigación (España)
Ministerio de Ciencia, Innovación y Universidades (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
description This study explores the effect of single doping with different rare earth elements (Y, La, and Yb) on the structural, morphological and electrical properties of CaMnO3 bulk ceramics, aiming to improve their thermoelectric performance. Ca(1-x)RxMnO3 (R = Y, La, Yb; x = 0, 0.05, 0.10) samples were synthesized via a solid-state reaction. XRD analysis confirmed the thermoelectric CaMnO3 phase as the major one, with orthorhombic perovskite structure. Small amounts of secondary phases (CaMn2O4 and Mn2O3) were also detected in some doped samples. The addition of dopants influenced the unit cell parameters, producing a shift to lower 2θ angles, confirming their incorporation into the ceramic structure. SEM micrographs revealed a significant reduction in grain size upon doping. Electrical resistivity measurements showed a metallic behavior for all doped samples. The Y-doped samples exhibited the highest resistivity values while the Yb-doped samples showed the lowest values (6.8 mΩ cm for the 0.10 doped one), which are among the lowest found in literature for this compound. The Seebeck coefficient values show minor changes for 0.05 doped samples when they decreased with increasing concentration of dopant. Consequently, the highest values were observed for 0.05-doped sample (−215 µV/K), independently of the dopant. This value is much higher than the ones typically reported in the literature. The highest value of the power factor was calculated for the 0.05 Yb doped sample, reaching approximately 0.56 mW/K2·m at 800°C. This value is higher than the best presented in the literature for this compound, to the best of our knowledge, and suggests that Yb3+ doping greatly enhances the high-temperature thermoelectric performance of bulk CaMnO3 ceramics, making it a promising dopant for high-efficiency thermoelectric materials.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
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dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/389983
url http://hdl.handle.net/10261/389983
dc.language.none.fl_str_mv Inglés
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info:eu-repo/grantAgreement/EC/H2020/101003375
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2023-001286-S
https://doi.org/10.1111/jace.20372
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spelling Enhancing electrical properties in CaMnO3-based ceramics: The impact of single doping with different elementsAmirkhizi, ParisaMadre, M. A.Constantinescu, GabrielTorres, M. A.Sotelo, AndresKovalevsky, Andrei V.Rasekh, ShahedThis study explores the effect of single doping with different rare earth elements (Y, La, and Yb) on the structural, morphological and electrical properties of CaMnO3 bulk ceramics, aiming to improve their thermoelectric performance. Ca(1-x)RxMnO3 (R = Y, La, Yb; x = 0, 0.05, 0.10) samples were synthesized via a solid-state reaction. XRD analysis confirmed the thermoelectric CaMnO3 phase as the major one, with orthorhombic perovskite structure. Small amounts of secondary phases (CaMn2O4 and Mn2O3) were also detected in some doped samples. The addition of dopants influenced the unit cell parameters, producing a shift to lower 2θ angles, confirming their incorporation into the ceramic structure. SEM micrographs revealed a significant reduction in grain size upon doping. Electrical resistivity measurements showed a metallic behavior for all doped samples. The Y-doped samples exhibited the highest resistivity values while the Yb-doped samples showed the lowest values (6.8 mΩ cm for the 0.10 doped one), which are among the lowest found in literature for this compound. The Seebeck coefficient values show minor changes for 0.05 doped samples when they decreased with increasing concentration of dopant. Consequently, the highest values were observed for 0.05-doped sample (−215 µV/K), independently of the dopant. This value is much higher than the ones typically reported in the literature. The highest value of the power factor was calculated for the 0.05 Yb doped sample, reaching approximately 0.56 mW/K2·m at 800°C. This value is higher than the best presented in the literature for this compound, to the best of our knowledge, and suggests that Yb3+ doping greatly enhances the high-temperature thermoelectric performance of bulk CaMnO3 ceramics, making it a promising dopant for high-efficiency thermoelectric materials.The authors wish to thank the Gobierno de Aragón (Grupo de Investigacion T54_23R) for financial support. Sh. Rasekh acknowledges the support of the Research Employment Contract FCT–CEECIND/02608/2017. This work was also developed within the scope of the PhD project of P. Amirkhizi (grant 2020.08051.BD funded by FCT) and the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020), UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020), and LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020), financed by national funds through the FCT/MCTES (PIDDAC). Authors would like to acknowledge the use of Servicio General de Apoyo a la Investigación-SAI, Universidad de Zaragoza. This article was supported by the projects UIDB/00481/2020 and UIDP/00481/2020—Fundação para a Ciência e a Tecnologia, DOI 10.54499/UIDB/00481/2020 (https://doi.org/10.54499/UIDB/00481/2020) and DOI 10.54499/UIDP/00481/2020 (https://doi.org/10.54499/UIDP/00481/2020). Gabriel Constantinescu acknowledges the support of the TEOsINTE project (Grant agreement ID: 101003375), funded under the H2020-EU.4. Programmes (Funding Scheme: MSCA-IF-EF-ST—Standard EF). M. A. Madre, M. A. Torres, and A. Sotelo acknowledge the grant CEX2023-001286-S funded by MICIU/AEI /10.13039/501100011033.With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (CEX2023-001286-S).Peer reviewedWiley-VCHGobierno de AragónFundação para a Ciência e a Tecnologia (Portugal)Ministério da Ciência, Tecnologia e Ensino Superior (Portugal)European CommissionAgencia Estatal de Investigación (España)Ministerio de Ciencia, Innovación y Universidades (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttp://hdl.handle.net/10261/389983reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/H2020/101003375info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2023-001286-Shttps://doi.org/10.1111/jace.20372Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3899832026-05-22T06:33:51Z
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