Subperiodic group
From Online Dictionary of Crystallography
Revision as of 11:32, 6 January 2009 by MassimoNespolo (talk | contribs)
Revision as of 11:32, 6 January 2009 by MassimoNespolo (talk | contribs)
Groupe sous-périodique (Fr); Gruppo subperiodico (It).
A subperiodic group is a group possessing translational periodicity in a subspace of the space where the group is acting. Subperiodic groups in two and three-dimensional spaces are classified in:
- frieze groups: 7 two-dimensional groups with one-dimensional translations;
- rod groups: 75 three-dimensional groups with one-dimensional translations;
- layer groups: 80 three-dimensional groups with two-dimensional translations.
See also
International Tables of Crystallography, Volume E