BORON K-EDGE XANES OF BORON OXIDES: TETRAHEDRAL B-O DISTANCES AND NEAR-SURFACE ALTERATION
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dc.contributor.author | Fleet M.E. | |
dc.contributor.author | Liu X. | |
dc.date.accessioned | 2021-02-13T10:39:39Z | |
dc.date.available | 2021-02-13T10:39:39Z | |
dc.date.issued | 2001 | |
dc.identifier | https://elibrary.ru/item.asp?id=32202507 | |
dc.identifier.citation | Physics and Chemistry of Minerals, 2001, 28, 6, 421-427 | |
dc.identifier.issn | 0342-1791 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/24891 | |
dc.description.abstract | Synchrotron radiation boron K-edge XANES spectra collected in fluorescence yield mode are reported for monoclinic metaboric acid [HBO2(II)], sinhalite (MgAlBO4), and a selection of boron oxides in which B is exclusively in trigonal coordination ([3]B). The anomalously high divergence of tetrahedral ([4]B–O) bond lengths in HBO2(II) and sinhalite is used to resolve fine structure at the [4]B K edge due to splitting of σ*(t2) antibonding orbitals. For HBO2(II), XANES peaks at 196.9 and 199.3 eV are assigned to [4]B–O distances of 1.564 and ∼1.440 (3) , respectively, and, for sinhalite, peaks at 196.8, 197.9, and 199.6 eV are assigned to distances of 1.586, 1.483 (2), and 1.442 , respectively. A correlation between peak splitting at the [4]B K edge and divergence of tetrahedral bond length is established for borates and borosilicates using data for sinhalite, HBO2(II), ferroaxinite, danburite, datolite, and BPO4. B K-edge XANES spectra collected in total electron yield mode, which probes to [4]B in HBO2(II) and about one-third of the [4]B in sinhalite are converted to [3]B in the near-surface structure. Moreover, HBO2(II), HBO2(III), sassolite (boric acid; H3BO3), and v-B2O3, which have markedly different bulk structures, have a similar near-surface layer composed of a relaxed anhydrous network of BO3 groups. | |
dc.title | BORON K-EDGE XANES OF BORON OXIDES: TETRAHEDRAL B-O DISTANCES AND NEAR-SURFACE ALTERATION | |
dc.type | Статья |
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