Analytical Electron Microscopy Study of a ZnO-NiO Solid Solution |
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Authors: | Goran Dra?i? Darja Lisjak |
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Institution: | (1) “Jozef Stefan” Institute, Jamova 39, 1001 Ljubljana, Slovenia, SI |
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Abstract: | Results of an analytical electron microscopy study of a binary ZnO-NiO system are reported and discussed. Emphasis was placed
on the determination of Ni concentration (solubility) in the ZnO grains using quantitative TEM-EDXS. The influence on the
results of beam diameter, foil thickness and corrections used are described and discussed. During the study small precipitates,
presumably NiO, were found in the ZnO grains of the ZnO-NiO samples with different ZnO/NiO ratios. In TEM, the precipitates
exhibited image contrast only at certain orientations and were normally invisible during the EDXS analysis. The presence of
the precipitates too small to be seen using scanning electron microscopy could explain erroneous results for the Ni concentration
in a ZnO solid-solution phase obtained previously using SEM-EDXS. Quantitative EDXS analyses were performed on ZnO grains
using different electron beam diameters. In each sample, the spread of the results was correlated to the beam diameter (analysed
volume). It was found that when the average number of precipitates was less than one per analysed volume the measured points
that included precipitates could easily be identified on the basis of their deviation from the mean value of the Ni content. |
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Keywords: | : Nickel oxide zinc oxide PTCR analytical electron microscopy energy dispersive X-ray spectroscopy |
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