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High-resolution B K-edge X-ray absorption near-edge structure (XANES) spectra of K 2 O-SiO 2 -B 2 O 3 -P 2 O 5  glasses are reported using synchrotron radiation. Two prominent features, peak a at about 194.0 eV and peak b at about 198.0 eV, are observed. On the basis of the qualitative MO diagrams of BO 3  3-  and BO 4  3-  clusters, peak a is assigned to the transition of B 1s electrons to the unoccupied B 2p z  (π*) states for threefold-coordinated B ( [3] B),and peak b is assigned to the transition of B 1s electrons to the unoccupied B σ* states for fourfold-coordinated B ( [4] B).B K-edge XANES spectroscopy is established as a method for "fingerprinting"  [3]  B and  [4]  B in borate and borosilicate minerals, glasses, and melts. Also, the relative proportions of [4JBand [3]Bin the borosilicate glasses are determined from the integrated peak areas for  [3] B and  [4]  B edge peaks and are shown to be generally in good agreement with recent  11 B MAS NMR measurements. However, the surface and near-surface structure of powder particles of per boric glasses containing P 2 O 5  appears to have a lower proportion of  [3] B entities than the bulk.

Coordination of B in K 2 O-SiO 2 -B 2 O 3 -P 2 O 5 glasses using B K-edge XANES