Electron microscopy
  
Pbcm (57) Space Group
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Table 1888. Pbcm (57) space group.

Name in the International Tables for Crystallography
 Pbcm
Lattice type
 P
Patterson space group
 47
Point group
 mmm
Crystal system
 Orthorhombic
Laue class
 mmm
Asymm
 0 ≤ x ≤ 1/2 and 0 ≤ y ≤ 1 and 0 ≤ z ≤1/4
Number of symmetry operators
 8 Crystal symmetry Is centrosymmetric because it has -x,-y,-z in its symmetry.
Symmetry (atomic coordinates)
X, Y, Z; -X, -Y, 1/2+Z; -X, 1/2+Y, 1/2-Z; X, 1/2-Y, -Z; -X, -Y, -Z; X, Y, 1/2-Z; X, 1/2-Y, 1/2+Z; -X, 1/2+Y, Z
Crystal examples
 β-PbO.
Er(HPO4)(NO3)·3 H2O: a = 10.1653 Å, b = 11.9178 Å, c = 6.8533 Å, V = 830.26, Z = 4.

 

 

 
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