Enhancing electrical properties in CaMnO<sub>3</sub>-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, P., Madre, M. A., Constantinescu, G., Torres, M. A., Sotelo, A., Kovalevsky, A. V., Rasekh, Sh.
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2025
País:España
Recursos:Universidad de Zaragoza
Repositorio:Zaguán. Repositorio Digital de la Universidad de Zaragoza
OAI Identifier:oai:zaguan.unizar.es:150329
Acesso em linha:http://zaguan.unizar.es/record/150329
Access Level:acceso abierto
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spelling Enhancing electrical properties in CaMnO<sub>3</sub>-based ceramics: The impact of single doping with different elementsAmirkhizi, P.Madre, M. A.Constantinescu, G.Torres, M. A.Sotelo, A.Kovalevsky, A. V.Rasekh, Sh.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.2025info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttp://zaguan.unizar.es/record/150329reponame:Zaguán. Repositorio Digital de la Universidad de Zaragozainstname:Universidad de ZaragozaInglésinfo:eu-repo/grantAgreement/ES/AEI/CEX2023-001286-Sinfo:eu-repo/grantAgreement/ES/DGA/T54-23Rinfo:eu-repo/semantics/openAccessoai:zaguan.unizar.es:1503292026-05-29T13:59:51Z
dc.title.none.fl_str_mv Enhancing electrical properties in CaMnO<sub>3</sub>-based ceramics: The impact of single doping with different elements
title Enhancing electrical properties in CaMnO<sub>3</sub>-based ceramics: The impact of single doping with different elements
spellingShingle Enhancing electrical properties in CaMnO<sub>3</sub>-based ceramics: The impact of single doping with different elements
Amirkhizi, P.
title_short Enhancing electrical properties in CaMnO<sub>3</sub>-based ceramics: The impact of single doping with different elements
title_full Enhancing electrical properties in CaMnO<sub>3</sub>-based ceramics: The impact of single doping with different elements
title_fullStr Enhancing electrical properties in CaMnO<sub>3</sub>-based ceramics: The impact of single doping with different elements
title_full_unstemmed Enhancing electrical properties in CaMnO<sub>3</sub>-based ceramics: The impact of single doping with different elements
title_sort Enhancing electrical properties in CaMnO<sub>3</sub>-based ceramics: The impact of single doping with different elements
dc.creator.none.fl_str_mv Amirkhizi, P.
Madre, M. A.
Constantinescu, G.
Torres, M. A.
Sotelo, A.
Kovalevsky, A. V.
Rasekh, Sh.
author Amirkhizi, P.
author_facet Amirkhizi, P.
Madre, M. A.
Constantinescu, G.
Torres, M. A.
Sotelo, A.
Kovalevsky, A. V.
Rasekh, Sh.
author_role author
author2 Madre, M. A.
Constantinescu, G.
Torres, M. A.
Sotelo, A.
Kovalevsky, A. V.
Rasekh, Sh.
author2_role author
author
author
author
author
author
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
dc.type.none.fl_str_mv info:eu-repo/semantics/article
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url http://zaguan.unizar.es/record/150329
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/ES/AEI/CEX2023-001286-S
info:eu-repo/grantAgreement/ES/DGA/T54-23R
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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dc.source.none.fl_str_mv reponame:Zaguán. Repositorio Digital de la Universidad de Zaragoza
instname:Universidad de Zaragoza
instname_str Universidad de Zaragoza
reponame_str Zaguán. Repositorio Digital de la Universidad de Zaragoza
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