000168086 001__ 168086 000168086 005__ 20260126155509.0 000168086 0248_ $$2sideral$$a146853 000168086 037__ $$aART-2015-146853 000168086 041__ $$aeng 000168086 100__ $$aKiirat, G. 000168086 245__ $$aDecrease of Ca3Co4O9+δthermal conductivity by Yb-doping 000168086 260__ $$c2015 000168086 5060_ $$aAccess copy available to the general public$$fUnrestricted 000168086 5203_ $$aIn this study, the effect of Yb-substitution on the structural, electrical and thermal transport properties of the Ca 3Co 4O 9 þ δ system has been investigated in the low temperature region (between 10 and 300 K). The resistivity of samples increases with raising the Yb-concentration in the system. All the samples show a metal-semiconductor transition below 85 K. In the analysis based on Strongly Correlated Fermi Liquid Model, an increased bandwidth and a reduced electronic correlation are found. It has also been found that the energy gap, E0, value also decreases with Yb substitution. The samples show positive thermoelectric power, indicating that dominant charge carriers are holes in all the samples. The thermoelectric power value decreases with Yb-substitution. From Mott equation, it is determined that the Fermi energy and hole concentration decrease in the Yb-susbtituted samples, compared to the undoped ones. Thermal conductivity, κ, is decreased in about 50% of the measured in undoped samples for the 0.01 and 0.03 Yb-doped samples at 300 K. Highest figure of merit, ZT, value is found to be 5.4 10 3 at 300 K for the unsubstituted sample and the ZT value decreases by the substitution. 000168086 536__ $$9info:eu-repo/grantAgreement/ES/DGA/T12$$9info:eu-repo/grantAgreement/ES/DGA/T87$$9info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2013-46505-C3-1-R 000168086 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.es 000168086 590__ $$a2.758$$b2015 000168086 591__ $$aMATERIALS SCIENCE, CERAMICS$$b3 / 27 = 0.111$$c2015$$dQ1$$eT1 000168086 592__ $$a0.823$$b2015 000168086 593__ $$aCeramics and Composites$$c2015$$dQ1 000168086 593__ $$aElectronic, Optical and Magnetic Materials$$c2015$$dQ1 000168086 593__ $$aSurfaces, Coatings and Films$$c2015$$dQ1 000168086 593__ $$aProcess Chemistry and Technology$$c2015$$dQ1 000168086 593__ $$aMaterials Chemistry$$c2015$$dQ1 000168086 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion 000168086 700__ $$aAksan, M.A. 000168086 700__ $$0(orcid)0000-0003-3466-9952$$aRasekh, Sh. 000168086 700__ $$0(orcid)0000-0002-0794-3998$$aMadre, M.A.$$uUniversidad de Zaragoza 000168086 700__ $$0(orcid)0000-0001-9995-6368$$aDiez, J.C.$$uUniversidad de Zaragoza 000168086 700__ $$0(orcid)0000-0001-7056-0546$$aSotelo, A.$$uUniversidad de Zaragoza 000168086 7102_ $$15001$$2065$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Cienc.Mater. Ingen.Metal. 000168086 773__ $$g41, 10 (2015), 12515-12528$$pCeram. int.$$tCeramics International$$x0272-8842 000168086 8564_ $$s1052427$$uhttps://zaguan.unizar.es/record/168086/files/texto_completo.pdf$$yPostprint 000168086 8564_ $$s1539017$$uhttps://zaguan.unizar.es/record/168086/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint 000168086 909CO $$ooai:zaguan.unizar.es:168086$$particulos$$pdriver 000168086 951__ $$a2026-01-26-14:50:10 000168086 980__ $$aARTICLE