Point-group symmetry and physical properties of crystals

Klapper, H.; Hahn, Th.

doi:10.1107/97809553602060000521

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

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International Tables for Crystallography (2006). Vol. A. ch. 10.2, pp. 804-808
https://doi.org/10.1107/97809553602060000521

Chapter 10.2. Point-group symmetry and physical properties of crystals

H. Klapper^a ^‡ and Th. Hahn^a ^*

^a Institut für Kristallographie, Rheinisch-Westfälische Technische Hochschule, Aachen, Germany
Correspondence e-mail: hahn@xtl.rwth-aachen.de

Footnotes

^‡ Present address: Mineralogisch-Petrologisches Institut, Universität Bonn, D-53115 Bonn, Germany.

¹ It should be noted, however, that asymmetric etch figures may occur that are due, for example, to an inclination of dislocation lines against the surface.
² This property can be represented by enantiomorphic spheres of point group 2 $[\infty]$ , cf. Table 10.1.4.2

.
³ In the literature, the requirement for pyroelectricity is frequently expressed as `a unique (or singular) polar axis'. This term, however, is misleading for point groups 1 and m.

International Tables for Crystallography (2006). Vol. A. ch. 10.2, pp. 804-808
https://doi.org/10.1107/97809553602060000521