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Figure 4
(a) Top and side views of the 3D rendered image of voids (gray regions, under of 20% NiO density) of the oxidized Ni particles. The red-meshed region represents the space that used to be occupied by the Ni particles before oxidation. We note that the voids were mainly formed inside the original Ni particles. (b) Regions with electron density over 80% NiO density shown as yellow crust.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 28| Part 2| March 2021| Pages 505-511
https://doi.org/10.1107/S1600577520015945
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