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@ARTICLE{LEMKE:887838,
author = {LEMKE, Fabian and RHEINHEIMER, Wolfgang and HOFFMANN,
Michael J.},
title = {{S}intering and grain growth in {S}r{T}i{O}3: impact of
defects on kinetics},
journal = {Journal of the Ceramic Society of Japan},
volume = {124},
number = {4},
issn = {1348-6535},
address = {Tokyo},
publisher = {Soc.},
reportid = {FZJ-2020-04464},
pages = {346 - 353},
year = {2016},
abstract = {The microstructural evolution of undoped and iron doped
SrTiO3 is analyzed during sintering at 1280°C in air and
reducing atmosphere. The focus is on densification and grain
growth during different holding times investigated by
dilatometric studies and microstructural analysis. The
sintering equations developed by Coble are used to
characterize sintering. The influence of point defects on
diffusion, densification and grain growth is evaluated using
basic defect chemistry equations. A space charge concept at
the grain boundaries is added to bulk defect chemistry
concepts to understand sintering of perovskites, since the
major part of mass transport during sintering occurs in this
region. The extension of the defect chemistry concept allows
to explain the change in diffusion mechanism during
sintering (grain boundary diffusion or bulk diffusion) as
well as grain growth stagnation observed in iron doped
SrTiO3. The results are used to separate the complex
interplay of densification and grain growth. While grain
growth decreases with increasing defect concentration, no
clear trend is observed for the densification kinetics,
since both grain growth and diffusion are relevant. The
results show that grain growth during sintering provides
comparable results to grain growth experiments in dense
SrTiO3 and, thus, pore drag seems not to be important. The
calculated diffusion coefficients are in good agreement with
literature data and show a strong dependency on the
concentration of strontium vacancies.},
cin = {IEK-1},
ddc = {660},
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:000379610100012},
doi = {10.2109/jcersj2.15265},
url = {https://juser.fz-juelich.de/record/887838},
}