000168228 001__ 168228
000168228 005__ 20260128162438.0
000168228 0248_ $$2sideral$$a146863
000168228 037__ $$aART-2025-146863
000168228 041__ $$aeng
000168228 100__ $$aAmirkhizi, P.
000168228 245__ $$aEnhancing electrical properties in CaMnO3-based ceramics: The impact of single doping with different elements
000168228 260__ $$c2025
000168228 5060_ $$aAccess copy available to the general public$$fUnrestricted
000168228 5203_ $$aThis 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.
000168228 536__ $$9info:eu-repo/grantAgreement/ES/DGA/T54-23R$$9info:eu-repo/grantAgreement/ES/MICIU/CEX2023-001286-S
000168228 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000168228 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000168228 700__ $$0(orcid)0000-0002-0794-3998$$aMadre, M.A.$$uUniversidad de Zaragoza
000168228 700__ $$0(orcid)0000-0002-1614-1962$$aConstantinescu, G.
000168228 700__ $$0(orcid)0000-0003-3995-5763$$aTorres, M.A.$$uUniversidad de Zaragoza
000168228 700__ $$0(orcid)0000-0001-7056-0546$$aSotelo, A.$$uUniversidad de Zaragoza
000168228 700__ $$aKovalevsky, A.V.
000168228 700__ $$0(orcid)0000-0003-3466-9952$$aRasekh, Sh.$$uUniversidad de Zaragoza
000168228 7102_ $$15002$$2305$$aUniversidad de Zaragoza$$bDpto. Ingeniería Diseño Fabri.$$cÁrea Expresión Gráfica en Ing.
000168228 7102_ $$15001$$2065$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Cienc.Mater. Ingen.Metal.
000168228 773__ $$g108, 5 (2025), e20372 [9 pp.]$$pJ. Am. Ceram. Soc.$$tJOURNAL OF THE AMERICAN CERAMIC SOCIETY$$x0002-7820
000168228 8564_ $$s869717$$uhttps://zaguan.unizar.es/record/168228/files/texto_completo.pdf$$yPostprint
000168228 8564_ $$s1598092$$uhttps://zaguan.unizar.es/record/168228/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000168228 909CO $$ooai:zaguan.unizar.es:168228$$particulos$$pdriver
000168228 951__ $$a2026-01-28-15:38:17
000168228 980__ $$aARTICLE