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Electrical conduction mechanisms in graphene nanoplatelet/yttria tetragonal zirconia composites

AuthorsPoyato, Rosalía ; Osuna, Francisco J. ; Morales-Rodríguez, A.; Gallardo-López, A.
Graphene nanoplatelets
Ceramic composites
Conduction mechanisms
Issue Date15-Aug-2018
CitationCeramics International 44(12): 14610-14616 (2018)
AbstractYttria 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%.
Publisher version (URL)https://doi.org/10.1016/j.ceramint.2018.05.082
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