TY  - JOUR
AU  - Bernardo, M. S.
AU  - Jardiel, T.
AU  - Caballero, A.
AU  - Bram, Martin
AU  - Gonzalez, Jesus
AU  - Peiteado, M.
TI  - Electric current activated sintering (ECAS) of undoped and titanium-doped BiFeO3 bulk ceramics with homogeneous microstructure
JO  - Journal of the European Ceramic Society
VL  - 39
IS  - 6
SN  - 0955-2219
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2019-02563
SP  - 2042 - 2049
PY  - 2019
AB  - BiFeO3 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 BiFeO3 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000461530100013
DO  - DOI:10.1016/j.jeurceramsoc.2019.01.045
UR  - https://juser.fz-juelich.de/record/862220
ER  -