Cation-driven electrical conductivity in Ta-doped orthorhombic zirconia ceramics
Resumen: 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.
Idioma: Inglés
DOI: 10.1016/j.ceramint.2020.10.227
Año: 2021
Publicado en: Ceramics International 47, 5 (2021), 7248-7252
ISSN: 0272-8842

Factor impacto JCR: 4.527 (2020)
Categ. JCR: MATERIALS SCIENCE, CERAMICS rank: 3 / 29 = 0.103 (2020) - Q1 - T1
Factor impacto SCIMAGO: 0.936 - Ceramics and Composites (Q1) - Electronic, Optical and Magnetic Materials (Q1) - Surfaces, Coatings and Films (Q1) - Process Chemistry and Technology (Q1) - Materials Chemistry (Q1)

Tipo y forma: Article (PostPrint)
Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)

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