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ELNES of O K edge for Nb2O5 and Ta2O5. a, Schematic of the octahedrally coordinated transition metal ion, causing a splitting Δ in the energy levels of the d-orbitals. b, O K edges of integrated experimental ELNES of amorphous Nb2O5 and simulated XANES of crystalline Nb2O5. c, O K edges of integrated experimental ELNES of amorphous Ta2O5 and simulated XANES of crystalline Ta2O5.
