Difference between revisions of "H centred cell"
From Online Dictionary of Crystallography
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*[[Centred lattices]] | *[[Centred lattices]] | ||
*[[D centred cell]] | *[[D centred cell]] | ||
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[[Category:Fundamental crystallography]] | [[Category:Fundamental crystallography]] | ||
Revision as of 15:49, 10 April 2017
Maille centrée H (Fr); Cella centrata H (It); H 複合単位胞 (Ja).
The H centred cell (triple hexagonal cell) is an alternative description of the hexagonal Bravais lattice. From the conventional hP cell one obtains the hH cell by taking the new basis vectors by means of one of the following transformation matrices, which give three possible orientations of the hH cell with respect to the hP cell:
H1: 110/-120/001 H2: 2-10/110/001 H3: 1-20/2-10/001
The resulting hH cell has centring nodes at 1/3,2/3,0 and 2/3,1/3,0.
Secondary and tertiary elements in the hP cell are exchanged in the hH cell. For example, the space-group symbol P3m1 become H31m when the triple cell is used.
See also
- Centred lattices
- D centred cell
- Section 1.5 in the International Tables for Crystallography, Volume A, 6th edition