Electron microscopy
 
P4mm (99) Space Group
- Practical Electron Microscopy and Database -
- An Online Book -
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Table 1880. P4mm (99) space group.

Name in the International Tables for Crystallography
P4mm P
123 4mm
Crystal system
Tetragonal 4/mmm
Asymm
0 ≤ x ≤ 1/2 and 0 ≤ y ≤ 1/2 and 0 ≤ z ≤ 1 and x ≤ y
8
Symmetry (atomic coordinates)

X, Y, Z; -X, -Y, Z; -Y, X, Z; Y, -X, Z; X, -Y, Z; -X, Y, Z; -Y, -X, Z; Y, X, Z

Crystal examples
t-BaTiO3 (a = 3.9998 Å and c = 4.018 Å): Ti (1b) at 1/2, 1/2, 0.482, Ba at 0, 0, 0, O1 (1b) at 1/2, 1/2, 0.016, and O2 (2c) at 1/2, 0, 0.515.

 

 

 

 

 

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