mP | mC |
The monoclinic lattice has an axis of order 2 imposed as a
symmetry constraint forcing two of the unit cell angles
to 90°. The most common convention, though not necessarily
the most logical one(!), is to choose
the symmetry axis to be parallel to the b direction so that
The monoclinic lattice is either primitive or centred. By convention the C-face centre is chosen for the centred lattice since for A- and I-centring, it is always possible to choose an alternative unit cell that is C-face centred.
© Copyright 1995-2006. Birkbeck College, University of London. | Author(s): Jeremy Karl Cockcroft |