Wyckoff position

Position de Wyckoff (Fr). Wyckoff punktlage (Ge). Posizione di Wyckoff (It). ワイコフ位置 (Ja)

Definition

A Wyckoff position consists of all points X of a space group G for which the site-symmetry groups are conjugate subgroups of G.

Each Wyckoff positon of a space group is labelled by a letter which is called the Wyckoff letter.

The number of different Wyckoff position of each space group is finite, the maximal numbers being 9 for plane groups (realized in p2mm) and 27 for space groups (realized in Pmmm).

See also

• crystallographic orbit
• lattice complex
• point configuration
• Wyckoff set
• Chapter 8.3.2 of International Tables of Crystallography, Section A