Electron microscopy
 
P42/nmc (137) Space Group
- Practical Electron Microscopy and Database -
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Table 1876. P42/nmc (137) space group.

Name in the International Tables for Crystallography
P42/nmc P
123 4/mmm
Crystal system
Tetragonal 4/mmm
Asymm
0 ≤ x ≤ 1/2 and 0 ≤ y ≤ 1/2 and 0 ≤ z ≤ 1/4
16
Symmetry (atomic coordinates)
X, Y, Z; -X, -Y, 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, 1/2-Z; 1/2+X, 1/2-Y, 1/2-Z; Y, X, -Z; -Y, -X, -Z; 1/2-X, 1/2-Y, 1/2-Z; 1/2+X, 1/2+Y, 1/2-Z; Y, -X, -Z; -Y, X, -Z; X, -Y, Z; -X, Y, Z; 1/2-Y, 1/2-X, 1/2+Z; 1/2+Y, 1/2+X, 1/2+Z
Crystal examples
3 mol% Y2O3-ZrO2: a = 3.605 Å and c = 5.179 Å.
ZrO2: a = 3.598 Å and c = 5.165 Å
t-ZrO2: two formula units per cell and slight modification of fluorite structure. Zr (2a): (0 0 0) and O (4d): (0 0.5 Oz).

 

 

 

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