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@ARTICLE{Vikrant:887818,
author = {Vikrant, K. S. N. and Rheinheimer, Wolfgang and Sternlicht,
Hadas and Bäurer, Michael and García, R. Edwin},
title = {{E}lectrochemically-driven abnormal grain growth in ionic
ceramics},
journal = {Acta materialia},
volume = {200},
issn = {1359-6454},
address = {Amsterdam [u.a.]},
publisher = {Elsevier Science},
reportid = {FZJ-2020-04444},
pages = {727 - 734},
year = {2020},
abstract = {A combined theoretical and experimental analysis was
performed to understand the effects of extrinsic ionic
species and point defects on the microstructural evolution
of ionic polycrystalline ceramics. The model naturally
incorporates the effects of drag on grain boundary motion as
imposed by the interfacially accumulated charged defects for
Fe doped SrTiO3. Two moving grain boundary types, i.e.,
highly mobile and immobile interfaces result in abnormal
grain growth. Fast moving grain boundaries leave a residual
charge network behind in the interior of the grains in the
form of bands of which in turn electrostatically attract
oxygen vacancies, thus enhancing the local ionic
conductivity of the polycrystal. Three grain size
populations are statistically identified: (a) a normal grain
population, as one would expect would happen in classical
systems; (b) an abnormal, large grain population, which
corresponds to those grains whose spatial extent is
statistically greater than the average; and (c) an
electrochemically persistent small grain size population
that is stabilized by the grain boundary electrical energy.
The study herein sets the stage to assess the effects of
externally applied fields such as temperature,
electromagnetic fields, stresses, and chemical stimuli to
develop textured, oriented microstructures as tailored for a
wide range of applications.},
cin = {IEK-1},
ddc = {670},
cid = {I:(DE-Juel1)IEK-1-20101013},
pnm = {899 - ohne Topic (POF3-899)},
pid = {G:(DE-HGF)POF3-899},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000580631600063},
doi = {10.1016/j.actamat.2020.08.027},
url = {https://juser.fz-juelich.de/record/887818},
}