Oxidation mechanism of nickel particles studied in an environmental transmission electron microscope

  • Jeangros Q
  • Hansen T
  • Wagner J
 et al. 
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The oxidation of nickel particles was studied in situ in an environmental transmission electron microscope in 3.2 mbar of O2between 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. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • Diffusion
  • Electron energy-loss spectroscopy
  • In situ transmission electron microscopy (TEM)
  • Kinetics
  • Oxidation

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