X-ray absorption near-edge structure (XANES) and Fourier transforms (FTs) of EXAFS spectra provide insights into the state of Fe even at low fractions as aberration-corrected transmission electron microscopy (Fig.S8) cannot distinguish Fe and Zn atoms due to approximate atomic number, and XPS is...
The element selective stereo photographs indicate similar hexagonal atomic arrangement with three-fold symmetry for Si and Fe atoms, which is consistent with a model based on a CsCl-type structure with B-type stacking. This is the first observation of stereoscopic atomic arrangements for ultra thin...
The impurities were chosen to take substitutional sites instead of interstitial sites due to the relatively large atomic radii of these elements (the list of elements and their atomic radii are shown in Table S5). In order to verify the stability of the substitutional model structures at high ...
In the frame of the effective-operator technique applied to atomic hyperfine structure in the lNl' configurations, we have computed ab initio, by means of the MCHF method, the electronic hfs parameters relevant to the two-body far-configuration-mixing effects on the (3d 7 4F, 4S)3,5F terms...
Low energy electron excitation collision strengths for fine-structure transitions involving the $m 3d^{6}4s^2\ ^{5}D_J$ ground term and the $m 3d^74s\ ^{5}F_J$ first excited term of neutral Fe are calculated. The model target atom includes the lowest three terms ($m ^{5}D$, ...
Employing the 80-level collision-radiative (CR) model with these dipole and forbidden transition probabilities, and Iron Project R-matrix collisional data, we present a number of [Fe VI] line ratios applicable to spectral diagnostics of photoionized H II regions. It is shown that continuum ...
Atomic radius empirical: 126 pm Covalent radius Low spin: 132±3 pm High spin: 152±6 pm Van der Waals radius 194 [1] pm Spectral lines of iron Other properties Natural occurrence primordial Crystal structure body-centered cubic (bcc) a=286.65 pm Crystal structure face-centered cubic...
Fig. 1. a) DTG curve for reduction of iron ore at 5 °C/min with 6% H2 (experimental and kinetic model results); b) Examples of curves of instantaneous reaction rate versus conversion in isothermal tests. Particularly, in isothermal tests at temperature above 600 °C a fast reaction stage...
Fe-bearing MgO [(Mg1−xFex)O] is considered a major constituent of terrestrial exoplanets. Crystallizing in the B1 structure in the Earth’s lower mantle, (Mg1−xFex)O undergoes a high-spin (S = 2) to low-spin (S = 0) transition at ∼45
Atomic structure analysis Full size image In order to further confirm the Fe state of Fe-SAs/NPS-HC, we performed Mössbauer spectroscopy measurements, which reveal the spectra with isomer shift (IS) of Fe3+or low/intermediate spin state of Fe2+. Mössbauer spectra of Fe-SAs/NPS-HC at ...