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Octahedral (red) and tetrahedral (blue) interstitial symmetry polyhedra in a face-centered cubic lattice. The actual interstitial atom would ideally be in the middle of one of the polyhedra. A close packed unit cell, both face-centered cubic and hexagonal close packed, can form two different shaped holes.
Interstitial atoms (blue) occupy some of the spaces within a lattice of larger atoms (red) In materials science, an interstitial defect is a type of point crystallographic defect where an atom of the same or of a different type, occupies an interstitial site in the crystal structure.
In a face centered cubic structure, an octahedral interstitial site is highlighted in red, and a tetrahedral interstitial site is highlighted in blue. Réalisé avec/made with : Inkscape. Voir aussi/see also. Image:Sites interstitiels empilement compact.svg
The picture represents two planes of a close-packed structure (it can be a hexagonal close-packed, a face-centered cubic, or any type of close-packed structure). One tetrahedral interstitial site is highlighted in blue, and one octahedral interstitial site is highlighted in red. Réalisé avec/made with : Inkscape. Voir aussi/see also
Six spheres surround an octahedral voids with three spheres coming from one layer and three spheres coming from the next layer. Structures of many simple chemical compounds, for instance, are often described in terms of small atoms occupying tetrahedral or octahedral holes in closed-packed systems that are formed from larger atoms.
Octahedral (red) and tetrahedral (blue) interstitial sites in a face-centered cubic lattice. Interstitial sites refer to the empty spaces in between the atoms in the crystal lattice. These spaces can be filled by oppositely charged ions to form multi-element structures.
This diagram is for octahedral interstices (coordination number six): 4 anions in the plane shown, 1 above the plane and 1 below. The stability limit is at r C /r A = 0.414. The radius ratio rule defines a critical radius ratio for different crystal structures, based on their coordination geometry. [1]
The limit of absorption at normal pressures is PdH0.7, indicating that approximately 70% of the octahedral holes are occupied. [13] Many interstitial hydrides have been developed that readily absorb and discharge hydrogen at room temperature and atmospheric pressure. They are usually based on intermetallic compounds and solid-solution alloys ...