TY  - JOUR
AU  - Fang, Xufei
AU  - Ding, Kuan
AU  - Janocha, Stephan
AU  - Minnert, Christian
AU  - Rheinheimer, Wolfgang
AU  - Frömling, Till
AU  - Durst, Karsten
AU  - Nakamura, Atsutomo
AU  - Rödel, Jürgen
TI  - Nanoscale to microscale reversal in room-temperature plasticity in SrTiO3 by tuning defect concentration
JO  - Scripta materialia
VL  - 188
SN  - 1359-6462
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2020-04438
SP  - 228 - 232
PY  - 2020
AB  - Incipient room-temperature plastic deformation in single-crystal SrTiO3 at the nanoscale and the microscale is contrasted by applying a scale-dependent indentation technique. Using nanoindentation pop-in, nanoindentation creep, and an evaluation of dislocation spacing via etch pit study, we demonstrate a reversal of yield stress for crystals with different vacancy concentrations and pre-existing dislocation densities. A competing mechanism between dislocation nucleation and dislocation motion on crystal plasticity at different length scales is highlighted. This finding enables us to complete the understanding of dislocation-mediated plasticity for ceramic oxides at the nanoscale as compared to the microscale and macroscale.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000558747100044
DO  - DOI:10.1016/j.scriptamat.2020.07.033
UR  - https://juser.fz-juelich.de/record/887812
ER  -