108302 20230519145350.0 doi 10.1016/j.ceramint.2020.10.227 sideral 121212 ART-2021-121212 eng Moshtaghioun, B.M. Cation-driven electrical conductivity in Ta-doped orthorhombic zirconia ceramics 2021 Access copy available to the general public Unrestricted This paper is devoted to the study of the electrical conductivity of tantalum-doped zirconia ceramics prepared by spark plasma sintering. In this study, the temperature dependence of conductivity in as-prepared specimens and in those previously annealed in air is determined and compared. A semi-empirical model, which is based on the oxidation states of the cations, has been developed and successfully assessed. According to this, the conductivity is basically controlled by the diffusion of tetravalent zirconium cations in both cases, although the concentration of these species varies drastically with the amount of induced oxygen vacancies. This is a quite unexpected fact, since conductivity is normally controlled by anionic diffusion in zirconia ceramics. This option is forbidden here due to the presence of substitutional pentavalent cations. Therefore, conductivity values are much lower than those reported in trivalent or divalent substitutional cation doped zirconia ceramics. info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 5.532 2021 MATERIALS SCIENCE, CERAMICS 3 / 29 = 0.103 2021 Q1 T1 0.887 2021 Electronic, Optical and Magnetic Materials 2021 Q1 Surfaces, Coatings and Films 2021 Q1 Process Chemistry and Technology 2021 Q1 Ceramics and Composites 2021 Q1 8.0 2021 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Laguna-Bercero, M.A. (orcid)0000-0002-7819-8956 Peña, J.I. Universidad de Zaragoza (orcid)0000-0003-2242-6822 Gómez-García, D. Domínguez-Rodríguez, A. 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. 47, 5 (2021), 7248-7252 Ceram. int. Ceramics International 0272-8842 372500 http://zaguan.unizar.es/record/108302/files/texto_completo.pdf Postprint 2368824 http://zaguan.unizar.es/record/108302/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:108302 articulos driver 2023-05-18-13:26:09 ARTICLE