Important definition in crystallography

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The close packed plane in a lattice structure is defined as the plane with the smallest interatomic spacing, specifically in the face-centered cubic (FCC) structure, which is identified as the (111) plane. The atomic spacing comparison reveals that the face diagonal and cube diagonal have different lengths than the cube edge, influencing packing efficiency. A close packing plane does not imply that atoms cannot be packed closer; rather, it indicates the plane where atoms are at their closest separation under normal conditions. Under high pressure, atoms may be forced closer together, but this is not typical in standard conditions. Understanding these concepts is crucial for studying crystal structures and their properties.
kelvin490
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Can anyone tell me what's the definition of close packed plane in lattice structure? How can I be sure the close packed plane in FCC structure is (111) ?
 
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The close packed plane has the smallest (minimum) interatomic spacing.

Compare the atomic spacing of the cube edge (edge of face) with face diagonal and cube diagonal.

This might help - http://www.egr.uri.edu/che/course/che333/Structure.pdf
 
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Astronuc said:
The close packed plane has the smallest (minimum) interatomic spacing.

Compare the atomic spacing of the cube edge (edge of face) with face diagonal and cube diagonal.

This might help - http://www.egr.uri.edu/che/course/che333/Structure.pdf

Does it mean a close packing plane is a plane that the atoms cannot be packed any closer?

Thanks for reply.
 
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kelvin490 said:
Does it mean a close packing plane is a plane that the atoms cannot be packed any closer?
No - it just means that it is the plane with the closest separation of the atoms.

http://www.jwave.vt.edu/crcd/farkas/lectures/structure.ppt

Under normal conditions, the atoms aren't packed closer. Only under increasingly high pressures would they get closer.
 
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