Figure 3. A valence XPS scan from a UO2 film (sample AP3). Vertical bars show the calculated spectrum for the UO812- (Oh) cluster reflecting uranium close environment in UO2 (ref 42).
The relative U 5f intensity I1 (rel. units) determined as the U 5f/U 4f7/2 intensity ratio without the shake-up satellites can be presented as dependence on the oxygen coefficient kO=2+x (Figure 4). For synthetic and natural oxides it is:44,45
I1 = 5.366 kO-7.173 (1),
which is in a good agreement with the dependence of the magnetic susceptibility on the oxygen coefficient.50,77. This agreement is not unexpected since the U 5f intensity is proportional to the number of the U 5f electrons responsible for the magnetic properties.
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