Artículo
Cation-driven electrical conductivity in Ta-doped orthorhombic zirconia ceramics
Autor/es | Moshtaghion, Bibi Malmal
Laguna Bercero, Miguel Ángel Peña, José I. Gómez García, Diego Domínguez Rodríguez, Arturo |
Departamento | Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Fecha de publicación | 2021 |
Fecha de depósito | 2022-12-21 |
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 ... 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. |
Agencias financiadoras | Ministerio de Ciencia e Innovación (MICIN). España Junta de Andalucía Gobierno de Aragón European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER) |
Identificador del proyecto | PID2019-103847RJ-I00
P18-RTJ-1972 MAT2016-77769-R DGA T02_17R MAT2015-68078-R PID2019-107106RB-C32 MAT2015-71411-R |
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