Group

International
Tables for
Crystallography
Volume D
Physical properties of crystals
Edited by A. Authier

pdf | chapter contents | chapter index | related articles

International Tables for Crystallography (2006). Vol. D. ch. 1.1, p. 19

Section 1.1.4.8.5.6. Group $[\bar{4}2m]$

A. Authier^a ^*

^a Institut de Minéralogie et de la Physique des Milieux Condensés, Bâtiment 7, 140 rue de Lourmel, 75015 Paris, France
Correspondence e-mail: aauthier@wanadoo.fr

| top | pdf |

One combines either the reductions for groups $[\bar{4}]$ and 222, or the reductions for groups $[\bar{4}]$ and 2mm.

(i) Twofold axis parallel to $[Ox_{1}]$ :

There are 6 independent components.
(ii) Mirror perpendicular to $[Ox_{1}]$ (the twofold axis is at $[45 ^{\circ}]$ )

The number of independent components is of course the same, 6.

International Tables for Crystallography (2006). Vol. D. ch. 1.1, p. 19