Poyato Galán, RosalíaOsuna, J.Morales Rodríguez, AnaGallardo López, Ángela María2023-12-272023-12-272018-08Poyato Galán, R., Osuna, J., Morales Rodríguez, A. y Gallardo López, Á.M. (2018). Electrical conduction mechanisms in graphene nanoplatelet/yttria tetragonal zirconia composites. Ceramics International, 44 (12), 14610-14616. https://doi.org/10.1016/j.ceramint.2018.05.082.0272-88421873-3956https://hdl.handle.net/11441/152822Yttria tetragonal zirconia polycrystalline (3YTZP) ceramic composites with 5, 10 and 20 vol% graphene nanoplatelets (GNPs) were prepared by spark plasma sintering (SPS) and their electrical conductivity as a function of temperature was characterized. The composites exhibit anisotropic microstructures so the electrical conductivity studies were carried out in two directions: perpendicular (σ⊥) and parallel (σ||) to the SPS pressing axis. The composites with 5 and 10 GNP vol% showed high electrical anisotropy, whereas the composite with 20 GNP vol % exhibited nearly isotropic electrical behavior. σ⊥ shows metallic-type behavior in the composites with 10 and 20 vol% GNP revealing that charge transport takes place through defect-free GNPs. For the composite with 5 vol % GNP the observed semiconductor-type behavior was explained by a two dimensional variable range hopping mechanism. σ|| shows metallic-type conductivity in the composite with 20 GNP vol% and positive dσ||/dT slope in the composites with 5 and 10 GNP vol%.application/pdf7 p.engAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Graphene nanoplatelets3YTZPCeramic compositesElectricalConductivityConduction mechanismsinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://doi.org/10.1016/j.ceramint.2018.05.082