Octahedral


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Related to Octahedral: octahedral coordination

Octahedral

Forms that exhibit the characteristics of a regular polygon having eight sides.
References in periodicals archive ?
Structure prediction of ordered and disordered multiple octahedral cation perovskites using SPuDS.
For three pigments Fe-[Al.sub.(pec)] (Figure 5.c) bands in the region of 460 nm occurred and are related to the presence of [Fe.sup.3+] in octahedral coordination, related to the transition [sup.6][T.sub.1] (G) [right arrow] [sup.4][T.sub.1] (G), [sup.4]E(G) [22].
Comparative FT-IR study of the removal and structural modifications during acid silicates of octahedral cations treatment of several silicates, Spectrochim Acta Part A 52: 1685-1694.
These are assigned as the expected tetragonally distorted d-d transitions [sup.1][A.sub.1g]([D.sub.4h]) [right arrow] [sup.1][E.sub.g]([D.sub.4h]) and [sup.1][A.sub.1g]([D.sub.4h]) [right arrow] [sup.1][A.sub.2g]([D.sub.4h]) of low-spin, octahedral Co(III) complexes [35].
Since [Gd.sup.3+] ion preferentially occupies the octahedral sites of the inverse spinel structure of [Fe.sub.3][O.sub.4] while hardly entering the smaller tetrahedral sites, only a certain relatively high concentration of gadolinium will be needed to set the conditions for its incorporation into the crystal lattice in a greater extent.
If the tetrahedral and octahedral sheets have one shared plane of oxygen atoms, the phyllosilicates are of type 1 : 1 (layers t-o).
The system energy [E.sub.s] of H located in the three octahedral sites and the tetrahedral site was calculated (Table 1).
From the results presented in Figure 1(a), it was observed that the peak related to Na-MMT octahedral structure peak at 3623 [cm.sup.-1] remained with a weak intensity in the spectra of 3 and 7 wt% f-Na-MMT/PP; however, this peak disappeared with 5 wt% f-Na-MMT.
We considered a model of Wyoming-type montmorillonite with octahedral and tetrahedral substitutions, as schematically shown in Figure 2.
Key words: equirectangular; octahedral; paraboloid; projection; sampling; texture map; transformation.