International
Tables for
Crystallography
Volume A
Space-group symmetry
Edited by Th. Hahn

© International Union of Crystallography 2006
International Tables for Crystallography (2006). Vol. A. ch. 2.2, p. 20

Section 2.2.6.2. Triclinic space groups

Th. Hahna* and A. Looijenga-Vosb‡

a Institut für Kristallographie, Rheinisch-Westfälische Technische Hochschule, Aachen, Germany, and bLaboratorium voor Chemische Fysica, Rijksuniversiteit Groningen, The Netherlands
Correspondence e-mail:  hahn@xtl.rwth-aachen.de

2.2.6.2. Triclinic space groups

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For each of the two triclinic space groups, three elevations (along a, b and c) are given, in addition to the general-position diagram [{\sf G}] (projected along c) at the lower right of the set, as illustrated in Fig. 2.2.6.1[link].

[Figure 2.2.6.1]

Figure 2.2.6.1| top | pdf |

Triclinic space groups ([\hbox{\sf G}] = general-position diagram).

The diagrams represent a reduced cell of type II for which the three interaxial angles are non-acute, i.e. [\alpha,\beta,\gamma \geq\! 90^{\circ}]. For a cell of type I, all angles are acute, i.e. [\alpha,\beta,\gamma \lt\!90^{\circ}]. For a discussion of the two types of reduced cells, reference is made to Section 9.2.2[link] .








































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