124070 20241125101131.0 doi 10.1007/s10854-022-09416-x sideral 132539 ART-2023-132539 eng Amaveda, H. Universidad de Zaragoza (orcid)0000-0003-2212-447X Anomalous grain growth in sintered Bi2Ca2Co2-xCuxOy + Ag ceramic composites by Cu doping 2023 Access copy available to the general public Unrestricted Bi2Ca2Co2 − xCuxOy + 4 wt%Ag (with x between 0 and 0.20) thermoelectric materials were prepared through a sol-gel method via nitrates. Powder XRD patterns showed the presence of thermoelectric phase as the major one, accompanied by metallic silver. SEM observations identified three different secondary phases in the samples, together with an exaggerated grain growth with Cu doping. The microstructural modifications are reflected in an important decrease of electrical resistivity, ∼ 3% when compared to undoped samples, due to the reduction on the number of grain boundaries, and the increase of Co4+ in the conducting layer. The minimum values at 650 ºC were obtained in 0.10 Cu-doped samples, 69 mΩ cm, which are lower than the reported in sintered samples. On the other hand, Seebeck coefficient was only slightly affected and reached the highest values at 650 ºC in 0.15 Cu-doped samples, 215 µV/K, which is practically the same measured in undoped ones, 211 µV/K, and lower than those reported for sintered samples. Consequently, the highest PF at 650 ºC has been determined in 0.10 Cu-doped samples, which is around 50% higher than the obtained in samples prepared through the classical solid-state method, or the undoped ones prepared in this work. info:eu-repo/grantAgreement/ES/DGA-FEDER/T54-20R info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2017-82183-C3-1-R info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 2.8 2023 ENGINEERING, ELECTRICAL & ELECTRONIC 151 / 353 = 0.428 2023 Q2 T2 PHYSICS, CONDENSED MATTER 37 / 79 = 0.468 2023 Q2 T2 PHYSICS, APPLIED 74 / 179 = 0.413 2023 Q2 T2 MATERIALS SCIENCE, MULTIDISCIPLINARY 230 / 439 = 0.524 2023 Q3 T2 0.512 2023 Electronic, Optical and Magnetic Materials 2023 Q2 Electrical and Electronic Engineering 2023 Q2 Atomic and Molecular Physics, and Optics 2023 Q2 Condensed Matter Physics 2023 Q2 Biophysics 2023 Q3 Biomaterials 2023 Q3 Bioengineering 2023 Q3 Biomedical Engineering 2023 Q3 5.0 2023 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Madre, M. A. Universidad de Zaragoza (orcid)0000-0002-0794-3998 Mora, M. Universidad de Zaragoza (orcid)0000-0003-4747-7327 Torres, M. A. Universidad de Zaragoza (orcid)0000-0003-3995-5763 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. 34, 1 (2023), 9 [8 pp.] J. mater. sci., Mater. electron. Journal of Materials Science: Materials in Electronics 0957-4522 1728081 http://zaguan.unizar.es/record/124070/files/texto_completo.pdf Versión publicada 2134173 http://zaguan.unizar.es/record/124070/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:124070 articulos driver 2024-11-22-11:59:08 ARTICLE