Coordination in HCP
Each host atom in an HCP lattice is surrounded by and touches 12 nearest neighbors, each at a distance of 2r:
There are six atoms in the planar hexagonal array (the central A layer);
There are three atoms in the B layer above the A layer;
There are three atoms in the B layer below the A layer.
The six atoms in the two B layers form a
trigonal prism
around the central atom in the A layer; the length of this prism is 2
.
CPIS
.
r.
(crossed stereo pair)
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