Topic
Chemical state
About: Chemical state is a research topic. Over the lifetime, 2378 publications have been published within this topic receiving 78183 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, the chemical bonding in γ-boron has been discussed, based on the known crystal structures of the new recently discovered phase, and the unexpected polarity of some B-B bonds and a sensible electron counting scheme are presented.
Abstract: The chemical bonding in γ-boron has been discussed, based on the known crystal structures of the new recently discovered phase. The unexpected polarity of some B-B bonds and a sensible electron counting scheme are presented. The relationship between the chemical bonding and the material hardness is also discussed.
15 citations
TL;DR: In this article, the chemical state and coordination state of copper ions were studied in 2 MeV, 1 × 10 17 Cu + ions/cm 2 -implanted silica glass by X-ray absorption fine structure spectroscopy.
Abstract: The chemical state and coordination state of copper ions have been studied in 2 MeV, 1 × 10 17 Cu + ions/cm 2 -implanted silica glass by X-ray absorption fine structure spectroscopy. It was found that the implanted Cu atoms are mainly present as Cu(I) state in the glass from the comparison of X-ray absorption near edge structure spectrum of the glass with those of CuO, Cu 2 O, CuAlO 2 , CuFeO 2 , Ca 2 CuO 3 and MgCu 2 O 3 crystals. We inferred from the extended X-ray absorption fine structure spectra that the implanted Cu atoms are coordinated by two oxygen atoms and the Cu–O interatomic distance is 0.188 nm in the glass.
15 citations
TL;DR: In this paper, supported amorphous catalysts, Ni-P-SiO 2 and Co-P -SiO2, with large surface areas were prepared by depositing amorphously NiP and CoP alloys on silica, and the results were compared with the hydrogenation activities of the catalysts.
15 citations
TL;DR: In this paper, the tantalum oxide-platinum interface electronic properties determined by X-ray photoelectron spectroscopy are found to depend on the dielectric stoichiometry and platinum chemical state.
Abstract: The tantalum oxide–platinum interface electronic properties determined by X-ray photoelectron spectroscopy are found to depend on the dielectric stoichiometry and platinum chemical state. We demonstrate the slow charging of the tantalum oxide in cases of Ta2O5/Pt and Ta2O5−y/Pt interfaces under the X-ray irradiation. This behavior is proposed to be related to the charge accumulation at oxygen vacancies induced traps. Based on the proposed methodology, we define the intrinsic conductive band offset (CBO) ∼1.3 eV (both for Ta2O5/Pt and Ta2O5−y/Pt) and CBO after the full saturation of the traps charging ∼0.5 eV, while the last one defines the energy position of charged traps below the bottom of conduction band. We demonstrate also the pining at the both Ta2O5/Pt and Ta2O5−y/Pt interfaces even in the “intrinsic” state, apparently induced by the presence of additional interfacial states. No shifts of Ta4f line and band alignment in over stoichiometric Ta2O5+x/Pt structure during X-ray irradiation, as well as t...
15 citations
TL;DR: In this paper, the synthesis of penta-bismuth hepta-oxide nitrate, Bi5O7NO3, via the chemical precipitation method was presented, which was characterised by several methods, which included X-ray powder diffraction, Xray photoelectron spectroscopy, scanning and transmission electron microscopy, Fourier transform infrared, thermogravimetric analysis, BET surface area and pH drift method to determine the pH of point of zero charge (pHpzc).
Abstract: This paper presents the synthesis of penta-bismuth hepta-oxide nitrate, Bi5O7NO3, via the chemical precipitation method. After calcination, the precipitate was characterised by several methods, which included X-ray powder diffraction, X-ray photoelectron spectroscopy, scanning and transmission electron microscopy, Fourier transform infrared, thermogravimetric analysis, BET surface area and pH drift method to determine the pH of point of zero charge (pHpzc). The study results revealed that Bi5O7NO3 had an orthorhombic crystal structure, a surface area of 1.6 m 2 g -1 and a point of zero charge at pH 9.7. The chemical state of Bi 5O7NO3 indicated the presence of three oxidation states of bismuth centre. Furthermore, the decolourization ability of Bi5O7NO3 to remove the azo dye was also evaluated. Although it had lower surface area, the removal efficiency was extremely good. This finding suggests that Bi5O7NO3 could be used as a promising adsorbent for azo dye removal. The XPS spectra showed that the accumulation of dye onto Bi5O7NO3 could be due to the anion exchange process, suggesting the birth of a new anion exchanger for azo dye removal.
15 citations