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Electric current activated sintering (ECAS) of undoped and titanium-doped BiFeO3 bulk ceramics with homogeneous microstructure

AuthorsBernardo, M. S. ; Jardiel, Teresa ; Caballero Cuesta, Amador ; Bram, M.; Gonzalez-Julian, J.; Peiteado, Marco
KeywordsECAS sintering
Flash and FAST sintering
Homogeneous microstructure
DC electricfield
AC electricfield
Issue Date2019
CitationJournal of the European Ceramic Society 39: 2042- 2049 (2019)
Abstract[EN] BiFeO ceramics have been consolidated applying an electric current activated/assisted sintering (ECAS) methodology under different electrical conditions. DC experiments produce a flash sintering regime by which the bulk cylindrical specimens densify in a few seconds; however, this goes together with a strong localization of the current flow within the material, leading to a dramatic lack of microstructural and compositional homogeneity. The situation changes under the alternate field; a more gradual FAST (Field Assisted Sintering) event is produced which allows the attainment of an exceptional microstructural homogeneity through the whole sintered compacts. Upon Ti-doping the overall diffusivity of the system is delayed but the AC conditions again yield a remarkable microstructural homogeneity in the consolidated material, this time even at the nanoscale level. Accordingly, bulk BiFeO ceramics with homogeneous micro-nanostructure can be successfully prepared by an ECAS methodology and at lower temperatures and much shorter times than by conventional solid-state sintering.
Publisher version (URL)http://dx.doi.org/10.1016/j.jeurceramsoc.2019.01.045
Identifiersdoi: 10.1016/j.jeurceramsoc.2019.01.045
e-issn: 1873-619X
issn: 0955-2219
Appears in Collections:(ICV) Artículos
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