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Oxygen K-edge spectra of amorphous B2O3 at 1 bar253 and 8.4 GPa, LiBO2,253 Li2B4O7,253 and Li3BO3,253 with the fraction of BO3 units and nonbridging oxygens indicated. Nonbridging orbitals induce a shift of the π* feature to lower energy and the conversion from BO3 to BO4 induces the decrease of its intensity.
