Although this bonding nature should be an important feature, the behaviors of peaks A and B could be more directly related to contribution variations from crystallographically different O sites. Figures and present the K-edge spectra of five and two independent O atoms for monoclinic and hexagonal phases, respectively. Evidently, the intensity of peak A for the O5 site of the monoclinic structure (Fig. ) and the O2 site of the hexagonal structure (Fig. ), is higher than that of peak B, where these oxygen atoms are coordinated by six Yb ions. Meanwhile, oxygen atoms with four and five coordinating Yb ions tend to have a comparable or relatively low intensity for peak A compared with that of peak B.