The tetrahedron model for the optical dielectric function of tetrahedrally coordinated amorphous compounds has been extended to materials made of four different atomic species. In particular, the case of hydrogen-rich silicon oxynitride is illustrated in detail with the general criteria used to extend ...
TetrahedronLambert, J. B. (1990). The interaction of silicon with positively charged carbon. Tetrahedron 46, 2677-2689. doi: 10.1016/S0040-4020(01)88362-9Lambert JB. The interaction of silicon with positively charged carbon. Tetrahedron 1990, 46:2677-2689....
The discharge of large wastewater volumes into the environment is currently one of the major environmental pollution concerns1,2,3,4. Among the more common and harmful pollutants are heavy metals, which produce a vast amount of emissions worldwide (just considering the industrial facilities of the ...
The structural, electronic, and optical properties of β-Ga2O3with oxygen vacancies are studied by employing first-principles calculations based on density function theory. Based on the defects formation energies, we conclude the oxygen vacancies are most stable in their fully charge states. The elec...
[53,54]. When the polishing powder is applied on the glass, it reacts with the surface to produce a complex cerium–oxygen–silicon compound, which is softer than the glass. This softer surface layer can then be more easily abraded to produce the final polished surface. Ceria powder is ...
However, this synthetic route lacks diversity when the target molecule contains a heteroatom such as nitrogen, oxygen or sulfur as the substituent of choice at C2 and/or C3. To overcome these limitations, the substrate 2,3-dichloroquinoxaline (DCQX) emerges as a versatile building block for ...
Six oxygens form a ring with an opening just large enough for a water molecule to pass. These oxygens are designated O(1) and the center of the ring is located at the position 2b in the P6/mcc unit cell. The other oxygens of the silicon tetrahedra are designated O(2) and they ...
(IVa), consists of carbon,silicon,germanium,tin, lead, and flerovium; thenitrogen group, 15 (Va), includesnitrogen,phosphorus,arsenic,antimony,bismuth, and moscovium; theoxygengroup, 16 (VIa), includes oxygen,sulfur,selenium,tellurium,polonium, and livermorium; and thehalogengroup, 17 (VIIa),...
The oxygen–oxygen intermolecular distances are shown along the chain. Full size image The X-ray scattering data presented here (Supplementary Fig. S1) and in the previous structural studies of ACC are very similar with peak intensities at about 2.22, 3.14, 5.36, 6.23 Å−1 (Supplementary ...
Figure 1 shows the atomic structure of 11 Å tobermorite63 investigated in this work. Figure 1 Atomic structure of 11 Å tobermorite investigated in this work. It shows a clear layered structure with backbone of Silicon-Oxygen tetrahedron. (a) the unit cell of tobermorite. (b) xz ...