I4cm (108) space group

I4cm (108) Space Group
- Practical Electron Microscopy and Database -
- An Online Book -

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Table 1870. I4cm (108) space group.

Name in the International Tables for Crystallography	I4cm	Lattice type	I
Patterson space group	139	Point group	4mm
Crystal system	Tetragonal	Laue class	4/mmm
Asymm	0 ≤ x ≤ 1/2 and 0 ≤ y ≤ 1/2 and 0 ≤ z ≤ 1/2 and y ≤ 1/2-x
Number of symmetry operators	16	Extinction conditions	k = 2n and l = 2n for 0 k l reflections (same as I4/mcm and I-4c2).
Symmetry (atomic coordinates)	X, Y, Z; -X, -Y, Z; -Y, X, Z; Y, -X, Z; X, -Y, 1/2+Z; -X, Y, 1/2+Z; -Y, -X, 1/2+Z; Y, X, 1/2+Z; 1/2+X, 1/2+Y, 1/2+Z; 1/2-X, 1/2-Y, 1/2+Z; 1/2-Y, 1/2+X, 1/2+Z; 1/2+Y, 1/2-X, 1/2+Z; 1/2+X, 1/2-Y, Z; 1/2-X, 1/2+Y, Z; 1/2-Y, 1/2-X, Z; 1/2+Y, 1/2+X, Z
Crystal examples

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