Local structure analysis of boron-doped graphite by soft x-ray emission and absorption spectroscopy using synchrotron radiation

Abstract

The local structure of boron-doped highly oriented graphite films was determined via soft x-ray emission and absorption spectroscopy using synchrotron radiation. Analysis of the BK and CK x-ray emission spectra using the discrete variational-Xa molecular orbital method clarified that boron atoms are chemisorbed onto graphite by substituting for carbon atoms in the carbon hexagonal rings. Compared to graphite, boron-doped graphite exhibits spectral differences in the higher edge of the CK x-ray emission spectrum and the CK x-ray absorption edge. Such a spectral profile of boron-doped graphite, which reflects the band structure, is well explained by the chemisorbed boron structure. V

Electronic Structure of Boron Doped HOPG: Selective Observation of Carbon and Trace Dope Boron by Means of X-ray Emission and Absorption Spectroscopy

“…This indicates that the electronic state of the sample surface and the bulk has not changed greatly. These peak shapes were very different from the peak shape of the B-K absorption of B-doped HOGF reported by Hanafusa et al [7]. They FIG.…”

“…In a previous study, Hanafusa et al reported B-K emission spectra for a high-temperature synthesized B-doped HOGF [7]. According to their quantum chemical consideration, both the main peak of 182 eV and the high-energy satellite peak of 185 eV are attributed to π orbitals, and only the tailing on the low energy side is attributed to σ orbitals.…”

“…In a previous study, Hanafusa et al reported X-ray emission and absorption spectra on B-K and C-K edge for a B-doped highly oriented graphite thin film (B-HOGF) synthesized at a high temperature with estimated B concentration around 0.4 to 2.2% [7]. They have also reported incident angle dependence for B-K and C-K for X-ray absorption spectra.…”

Chemical State Mapping of Degraded B4C Control Rod Investigated with Soft X-ray Emission Spectrometer in Electron Probe Micro-analysis

“…Five B-containing crystalline materials were prepared; B granules (3–7 mm) and B 2 O 3 powder were purchased from Kojundo Chemical Laboratory Co., Ltd. FeB and Fe 2 B (500 μm in diameter) were purchased from Goodfellow Cambridge Ltd. B 4 C granules were supplied by a domestic BWR manufacturer in Japan. The chemical compositions were shown elsewhere 7 .…”

“…However, these conventional methods do not easily provide chemical state information, as they are limited by insufficient energy resolution. Although soft X-ray emission or absorption spectrometry, using synchrotron radiation facilities, may provide an understanding of the chemical state of B 6 7 , it is not economically viable to simultaneously obtain a detailed spatial distribution.…”