TY  - JOUR
AU  - Jeangros, Q.
AU  - Hansen, T. W.
AU  - Wagner, J. B.
AU  - Dunin-Borkowski, Rafal
AU  - Hébert, C.
AU  - Van herle, J.
AU  - Hessler-Wyser, A.
TI  - Oxidation mechanism of nickel particles studied in an environmental transmission electron microscope
JO  - Acta materialia
VL  - 67
SN  - 1359-6454
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2015-02610
SP  - 362 - 372
PY  - 2014
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000333495200031
DO  - DOI:10.1016/j.actamat.2013.12.035
UR  - https://juser.fz-juelich.de/record/189443
ER  -