Por favor, use este identificador para citar o enlazar este ítem:
http://cimav.repositorioinstitucional.mx/jspui/handle/1004/2365| Magnetism and decarburization-like diffusion process on V2O5-doped ZnO Ceramics | |
| SION FEDERICO OLIVE MENDEZ CARLOS ROBERTO SANTILLAN RODRIGUEZ KARLA CAMPOS VENEGAS José Andrés Matutes Aquino FRANCISCO ESPINOSA MAGAÑA | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Magnetism, Decarburization, Diffusion, V2O5, ZnO, Ceramics | |
| We 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. | |
| Centro de Investigación en Materiales Avanzados. | |
| 02-02-2015 | |
| Artículo | |
| Inglés | |
| PROCESOS QUÍMICOS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos |
Cargar archivos:
| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| Magnetism and decarburization-like diffusion process on V2O5-doped ZnO ceramics PREPRINT.pdf | 1.53 MB | Adobe PDF | Visualizar/Abrir |