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Figure 8
The results of the PCA analysis of the reduced µXRD patterns. (a)–(c) The loadings for the first three components. These show the three main clusters of the data. Panel (a) shows the mean average, panels (b) and (c) show the main deviations from it. Panel (d) shows the sum of the remaining loadings. These are indicative of a single-crystal artefact in the data, which the PCA has identified. The scores for these states are shown in (h). The loadings were then thresholded and applied as a mask to the tomography result in order to give representative µXRD patterns of each region identified. Panels (e)–(g) show these results next to their respective spatial clustering. Panel (g) shows a definite shoulder appearing on the large graphite peak at 3.42 Å. This suggests an expansion of the support. Panels (f) and (g) also show very different composition, the former being mostly in CoO, whereas the majority of the particles imaged are a mixture of CoO and metallic Co.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 24| Part 1| January 2017| Pages 248-256
https://doi.org/10.1107/S1600577516017756
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