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

International Tables for Crystallography (2006). Vol. A, ch. 14.3, pp. 873-874

Section 14.3.3. Reflection conditions

W. Fischera and E. Kocha*

aInstitut für Mineralogie, Petrologie und Kristallographie, Philipps-Universität, D-35032 Marburg, Germany
Correspondence e-mail:  kochelke@mailer.uni-marburg.de

14.3.3. Reflection conditions

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Wyckoff positions belonging to the same lattice complex show analogous reflection conditions. Therefore, lattice complexes have also been used to check the reflection conditions for all Wyckoff positions in the space-group tables of this volume.

The descriptive symbols may supply information on the reflection conditions. If the symbol does not contain any distribution-symmetry part, the reflection conditions of the Wyckoff position are indicated by the symbol of the invariant lattice complex in the central part (e.g. [P4/nmm\ g]: C4xx shows that the reflection condition is that of a C lattice, [hkl\!:\! h+k = 2n]). In the case that the site set consists of only one point, i.e. the Wyckoff position belongs to a Weissenberg complex, all conditions for general reflections hkl that may arise from special choices of the coordinates can be read from the central part of the symbol (e.g. [P4/nmm\ c\hbox{:}\ 0{1 \over 2}0\; .. 2\ CI1z] indicates that, by special choice of z, either [hkl\hbox{:}\ h+k = 2n] or [hkl\hbox{:}\ h+k+l = 2n] may be produced).








































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