1996年5月1日 · B K-edge x-ray absorption near-edge structure (XANES) spectra of β-B 105, B 4 C, h-BN, B 2 O 3 and BPO 4, as well as optic fiber glasses in the K 2 O SiO 2 B 2 O 3 system, are reported using a Grasshopper beamline. The chemical shift of the B K-edge is correlated with the oxidation state of B, electronegativity of ligand and coordination ...

2023年11月3日 · K-edge（K边缘） 是X射线吸收光谱中的一个特定能量点。 这个点与原子核的K壳层（内壳层）电子有关。 当入射X射线的能量等于或略高于K壳层电子的束缚能量时，会发生K-edge吸收。

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).

2000年7月1日 · Synchrotron radiation B K-edge XANES spectra are reported for 19 borate and borosilicate minerals. The spectra are characterized by three prominent features; a sharp peak (A) at ~194 eV (the edge feature of trigonal B; III B), a broader peak (B) at 197–199 eV (the edge feature of tetrahedral B, IV B), and a broad peak (C) at 200–201 eV for ...

In the B K- edge ( Fig. 3 (a)), V B produces a small shift in the main σ* peak (originally at 197.7 eV) but no other significant changes. In contrast, V N causes a sharp additional peak at...

2000年7月1日 · Comparison of B K-edge XANES spectra collected using total electron yield (sampling depth <60 Å) and fluorescence yield (sampling depth <1100 Å) shows that borates and borosilicates readily...

Recent studies showed that B K-edge XANES of minerals containing BO n (n = 3, 4) units is probably dominated by the atomic arrangement: spectra generated at the BO 3 units are characterized by an intensive sharp peak followed by a broader peak about 10 eV above it, while spectra generated at the BO 4 units are characterized by a single peak ...

2007年2月2日 · The B K-edge XANES spectra are characterized by three prominent features: a sharp peak at ∼194 eV (the edge feature of trigonal B), a broader peak at 198–200 eV (the edge feature of ...

2010年5月7日 · In order to assess the usability of X-ray absorption near-edge structure (XANES) for studying the structure of BO n-containing materials, the dependence of theoretical XANES at the B K-edge on the way the scattering potential is constructed is investigated. Real-space multiple-scattering calculations are performed for self-consistent and non ...

2007年2月2日 · The potential of x‐ray absorption near‐edge structure (XANES) spectroscopy for studying medium range order in borate glasses is assessed by theoretical modelling of the spectra. B K edge XANES is calculated in case that B atoms are located in isolated BO 3 and BO 4 units and in case that B atom are located in superstructural units of 9–15 ...