Hexagonal lattice
![](http://upload.wikimedia.org/wikipedia/commons/thumb/e/ee/2d-bravais.svg/350px-2d-bravais.svg.png)
1 – oblique (monoclinic),
2 – rectangular (orthorhombic),
3 – centered rectangular (orthorhombic),
4 – hexagonal,
5 – square (tetragonal).
The hexagonal lattice or triangular lattice is one of the five two-dimensional Bravais lattice types.[1] The symmetry category of the lattice is wallpaper group p6m. The primitive translation vectors of the hexagonal lattice form an angle of 120° and are of equal lengths,
The reciprocal lattice of the hexagonal lattice is a hexagonal lattice in reciprocal space with orientation changed by 90° and primitive lattice vectors of length
Honeycomb lattice[]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/46/Honeycomb_lattice_-_hexagonal_lattice_with_a_two-atom_basis.svg/220px-Honeycomb_lattice_-_hexagonal_lattice_with_a_two-atom_basis.svg.png)
The honeycomb lattice is a special case of the hexagonal lattice with a two-atom basis.[1] The centers of the hexagons of a honeycomb form a hexagonal lattice, and the honeycomb lattice can be seen as the union of two offset triangular lattices.
In nature, carbon atoms of the two-dimensional material graphene are arranged in a honeycomb lattice.
See also[]
- Square lattice
- Hexagonal tiling
- Close-packing
- Centered hexagonal number
- Eisenstein integer
- Voronoi diagram
References[]
- ^ a b Rana, Farhan. "Lattices in 1D, 2D, and 3D" (PDF). Cornell University. Archived (PDF) from the original on 2020-12-18.
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- Lattice points