%0 Journal Article
%A Fang, Xufei
%A Ding, Kuan
%A Janocha, Stephan
%A Minnert, Christian
%A Rheinheimer, Wolfgang
%A Frömling, Till
%A Durst, Karsten
%A Nakamura, Atsutomo
%A Rödel, Jürgen
%T Nanoscale to microscale reversal in room-temperature plasticity in SrTiO3 by tuning defect concentration
%J Scripta materialia
%V 188
%@ 1359-6462
%C Amsterdam [u.a.]
%I Elsevier Science
%M FZJ-2020-04438
%P 228 - 232
%D 2020
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000558747100044
%R 10.1016/j.scriptamat.2020.07.033
%U https://juser.fz-juelich.de/record/887812