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hexagonal closest-packed structureZoomA-Z

Subject - General Chemistry

The layer sequence in the hexagonal closest-packed structure is ABABAB... .

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Fig.1
Wireframe model
Fig.2
Layer sequence

Layer sequence: A,B,A

Each sphere is surrounded by six neighbors in a hexagonal layer. The foreground and the underlying layer of red spheres are superposable. The hexagonal layers are stacked so that it is possible to look through the layer of yellow spheres to the gray layer below. The layers are offset such that the spheres of each layer lie in the holes of the layer below. The packing efficiency of the spheres in this type of structure is 74%.

See also: closest-packed structure , cubic closest-packed structure