Introduction to Crystallography (throw flash )
Crystal Structures > Packing of Atoms
In order to try to understand how different structures can arise, we can represent atoms as hard spheres.
If we pack equal spheres as tightly as possible on a level surface, this hexagonal arrangement is called a close packed layer. If the layer extends to infinity, each atom is in contact with six others in the same layer.
Another way we can pack atoms is in a square array. This packing is not as dense as the gaps (interstices) between the atoms are larger. Each atom is in contact with four other atoms in the same layer.
To use the site and the flash click on the link below:
http://www.materials.ac.uk/elearning/matter/Crystallography/CrystalStructures/packing-of-atoms.html
If we pack equal spheres as tightly as possible on a level surface, this hexagonal arrangement is called a close packed layer. If the layer extends to infinity, each atom is in contact with six others in the same layer.
Another way we can pack atoms is in a square array. This packing is not as dense as the gaps (interstices) between the atoms are larger. Each atom is in contact with four other atoms in the same layer.
To use the site and the flash click on the link below:
http://www.materials.ac.uk/elearning/matter/Crystallography/CrystalStructures/packing-of-atoms.html
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