Important definition in crystallography

[kelvin490]

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) ?

 

[Astronuc]

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

 

[kelvin490]

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.

 

[Astronuc]

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.