International
Tables for Crystallography Volume A1 Symmetry relations between space groups Edited by Hans Wondratschek and Ulrich Müller © International Union of Crystallography 2006 |
International Tables for Crystallography (2006). Vol. A1. ch. 3.1, p. 429
Section 3.1.1.6.3. Basis vectors
a
Fachbereich Chemie, Philipps-Universität, D-35032 Marburg, Germany |
The column `Axes' shows how the basis vectors of the unit cell of a subgroup result from the basis vectors a, b and c of the space group considered. This information is omitted if there is no change of basis vectors.
A formula such as `' together with the restrictions `' and `; ' means that for a given index p there exist several subgroups with different lattices depending on the values of the integer parameters q (odd) and r (even) within the limits of the restriction. In this example, the prime number p must be modulo 4 (i.e. 5, 13, 17, …); if it is, say, , the values of q and r may be and .1