Magnetism and decarburization-like diffusion process on V2O5-doped ZnO Ceramics

dc.creatorSION FEDERICO OLIVE MENDEZ
dc.creatorCARLOS ROBERTO SANTILLAN RODRIGUEZ
dc.creatorKARLA CAMPOS VENEGAS
dc.creatorJosé Andrés Matutes Aquino
dc.creatorFRANCISCO ESPINOSA MAGAÑA
dc.date2015-02-02
dc.date.accessioned2023-07-21T15:32:02Z
dc.date.available2023-07-21T15:32:02Z
dc.identifierhttp://cimav.repositorioinstitucional.mx/jspui/handle/1004/2365
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7728265
dc.descriptionWe report on vanadium-doped ZnO ceramics to be used as sputtering targets. Prior to a sintering process, ZnO and V2O5 powders were milled in stoichiometric proportion to obtain Zn0.95V0.05O1 þδ composition. Sintering process of compressed powders was carried out at 900, 1000 and 1100 °C in air for 1, 2, 4, 6, 10 and 14 h. During the sintering process, decarburization-like diffusion of V2O5 (i.e. reduction of the V concentration in the pellet) leads to a non-homogeneous distribution of V. The solution of second Fick's law for a decarburization process C(z,t)=(C0 - CS)erf (z/2√(δDgbt ))+Cs was used to find δDgb, where Dgb is the grain boundary diffusion coefficient and δ the grain boundary width. δDgb strongly depends on sintering time, given that ZnO grain growth is accomplished with a simultaneous reduction of high diffusivity paths. X-ray diffraction analysis shows that residual V2O5 react with ZnO to produce γ-Zn3(VO4)2 and ZnV2O4 secondary phases that nucleate during cooling in interstitial sites between ZnO grains. Energy Dispersive X-Ray Spectroscopy (EDS) analysis was used to obtain vanadium concentration profiles. No vanadium was observed in the lattice of ZnO grains, the only diffusion mechanism corresponds to Harrison's C-type kinetics. Ceramics exhibit a very low magnetization, reaching a maximum saturation magnetization Ms=14.6*10-3 emu/cm3 on the sample annealed at 1100 °C for 1 h. Magnetic signals are originated at the interface between the V-based secondary phases and ZnO grains, where a composition near to Zn0.95V0.05O is obtained.
dc.formatapplication/pdf
dc.languageeng
dc.publisherCentro de Investigación en Materiales Avanzados.
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttp://creativecommons.org/about/cc0/
dc.subjectinfo:eu-repo/classification/Magnetism, Decarburization, Diffusion, V2O5, ZnO, Ceramics/Magnetism, Decarburization, Diffusion, V2O5, ZnO, Ceramics
dc.subjectinfo:eu-repo/classification/cti/2
dc.subjectinfo:eu-repo/classification/cti/23
dc.subjectinfo:eu-repo/classification/cti/2303
dc.subjectinfo:eu-repo/classification/cti/330303
dc.subjectinfo:eu-repo/classification/cti/330303
dc.titleMagnetism and decarburization-like diffusion process on V2O5-doped ZnO Ceramics
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/submittedVersion


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