168056 20260126155509.0 doi 10.1007/s10854-014-2469-y sideral 109166 ART-2015-109166 eng Torres, M.A. Universidad de Zaragoza (orcid)0000-0003-3995-5763 Decrease of electrical resistivity in Ca3Co4O9 thermoelectric ceramics by Ti doping 2015 Ca3Co4−xTixO9 polycrystalline thermoelectric ceramics with small amounts of Ti have been prepared by the classical solid state method. X-ray diffraction data have shown that Ca3Co4O9 is the major phase, with small amounts of the Ca3Co2O6 one. Moreover, they show that Ti has been incorporated into these two phases. Electrical resistivity decreases, compared with the values for undoped samples, until 0.03-Ti doped ones. Further Ti addition produces an increase of resistivity with respect to the 0.03 Ti doped samples. Seebeck coefficient does not appreciably change in all the measured temperature range, independently of Ti content. The improvement in electrical resistivity leads to about 55 % higher power factor values for the 0.03 Ti-doped samples than that obtained in the undoped ones. The maximum power factor at 800 °C, around 0.33 mW/K2 m, is slightly higher than the obtained in higher density samples, clearly indicating the good thermoelectric performances of these doped samples. Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/DGA/T12 info:eu-repo/grantAgreement/ES/DGA/T87 info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2013-46505-C3-1-R info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 1.798 2015 ENGINEERING, ELECTRICAL & ELECTRONIC 87 / 255 = 0.341 2015 Q2 T2 MATERIALS SCIENCE, MULTIDISCIPLINARY 116 / 270 = 0.43 2015 Q2 T2 PHYSICS, APPLIED 60 / 144 = 0.417 2015 Q2 T2 PHYSICS, CONDENSED MATTER 36 / 67 = 0.537 2015 Q3 T2 0.465 2015 Atomic and Molecular Physics, and Optics 2015 Q2 Biomedical Engineering 2015 Q2 Electrical and Electronic Engineering 2015 Q2 Electronic, Optical and Magnetic Materials 2015 Q2 Biophysics 2015 Q3 Condensed Matter Physics 2015 Q3 Biomaterials 2015 Q3 Bioengineering 2015 Q3 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Rasekh, Sh. (orcid)0000-0003-3466-9952 Bosque, P. (orcid)0000-0003-2501-4479 Constantinescu, G. (orcid)0000-0002-1614-1962 Madre, M.A. Universidad de Zaragoza (orcid)0000-0002-0794-3998 Diez, J.C. Universidad de Zaragoza (orcid)0000-0001-9995-6368 Sotelo, A. Universidad de Zaragoza (orcid)0000-0001-7056-0546 5002 305 Universidad de Zaragoza Dpto. Ingeniería Diseño Fabri. Área Expresión Gráfica en Ing. 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. 26, 2 (2015), 815-820 J. mater. sci., Mater. electron. Journal of Materials Science: Materials in Electronics 0957-4522 1134732 http://zaguan.unizar.es/record/168056/files/texto_completo.pdf Postprint 1166001 http://zaguan.unizar.es/record/168056/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:168056 articulos driver 2026-01-26-14:49:21 ARTICLE