%0 Journal Article
%A Jeangros, Q.
%A Hansen, T. W.
%A Wagner, J. B.
%A Dunin-Borkowski, Rafal
%A Hébert, C.
%A Van herle, J.
%A Hessler-Wyser, A.
%T Oxidation mechanism of nickel particles studied in an environmental transmission electron microscope
%J Acta materialia
%V 67
%@ 1359-6454
%C Amsterdam [u.a.]
%I Elsevier Science
%M FZJ-2015-02610
%P 362 - 372
%D 2014
%X The oxidation of nickel particles was studied in situ in an environmental transmission electron microscope in 3.2 mbar of O2 between ambient temperature and 600 °C. Several different transmission electron microscopy imaging techniques, electron diffraction and electron energy-loss spectroscopy were used to study the evolution of the microstructure and the local chemical composition of the particles during oxidation. Our results suggest that built-in field effects control the initial stages of oxidation, with randomly oriented NiO crystallites and internal voids then forming as a result of outward diffusion of Ni2+ along NiO grain boundaries, self-diffusion of Ni2+ ions and vacancies, growth of NiO grains and nucleation of voids at Ni/NiO interfaces. We also observed the formation of transverse cracks in a growing NiO film in situ in the electron microscope.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000333495200031
%R 10.1016/j.actamat.2013.12.035
%U https://juser.fz-juelich.de/record/189443