Crystallographic Information Framework

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Index

Symmetry dictionary (symCIF) version 1.0.1

_space_group_Wyckoff.site_symmetry

Name:
'_space_group_Wyckoff.site_symmetry'

Definition:

   The subgroup of the space group that leaves the point fixed.
   It is isomorphic to a subgroup of the point group of the
   space group. The site-symmetry symbol indicates the symmetry
   in the symmetry direction determined by the Hermann-Mauguin
   symbol of the space group (see International Tables for
   Crystallography Volume A, Section 2.2.12).

   Ref: International Tables for Crystallography (2002). Volume A,
        Space-group symmetry, edited by Th. Hahn, 5th ed.
        Dordrecht: Kluwer Academic Publishers.

Examples:

2.22 position 2b in space group No. 94, P 42 21 2
42.2 position 6b in space group No. 222, P n -3 n
2.. Site symmetry for the Wyckoff position 96f in space group No. 228, F d -3 c. The site-symmetry group is isomorphic to the point group 2 with the twofold axis along one of the {100} directions.

Type: char

Mandatory item: no

Category: space_group_Wyckoff


International Tables for Crystallography

Volume G: Definition and exchange of crystallographic data

First online edition (2006)

Edited by S. R. Hall and B. McMahon

An essential guide and reference to CIF for programmers, data managers handling crystal-structure information and practising crystallographers.