Symmetry Elements in Space Groups and Point Groups. Addenda to two IUCr Reports on the Nomenclature of Symmetry

Flack, H.D.; Wondratschek, H.; Hahn, T.; Abrahams, S.C.

doi:10.1107/S0108767399012283

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Figure 1
This figure replaces Fig. 3 in the Report on the Nomenclature of Symmetry by de Wolff et al. (1992

), with three diagrams (7), (11) and (15) included that previously were missing, see §3

. The different kinds of glide plane are represented graphically by diagrams similar to the general-position diagrams in ITA

. The origin is always in the upper left corner, with symmetry operations represented by a `+' for translations, a `−' for glide reflections. Double lines represent crystal axes in the plane of the figure, single lines other cell edges. Each diagram contains a space-group example with glide-plane location listed. The setting is conventional in all diagrams with two crystal axes as cell edges; it is unconventional in all other cases. The diagrams are presented in columns of Bravais net types of the section plane; the unconventional c-centred setting of the square net in diagrams (7) and (15) is the result of a section parallel to (001) through a conventional cubic F lattice. The vertical edge of the cell (in the plane of the paper) represents: (i) the c axis in diagrams (1), (4), (5), (8), (9), (12), (13), (16), (17), (18); (ii) the a axis in diagrams (2), (3), (6), (7), (10), (11), (14), (15). The horizontal edge of the cell represents: (i) the a axis in diagrams (1), (9); (ii) the [ $[\bar 1]$ $[\bar 1]$ 0] direction in diagrams (5), (16), (18); (iii) the [ $[\bar 1]$ 10] direction in diagrams (4), (8), (12), (13), (17); (iv) the b axis in diagrams (2), (3), (6), (7), (10), (11), (14), (15).

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ISSN: 2053-2733

Volume 56| Part 1| January 2000| Pages 96-98

doi:10.1107/S0108767399012283

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