Practical Electron Microscopy and Database

An Online Book, Second Edition by Dr. Yougui Liao (2006)

Practical Electron Microscopy and Database - An Online Book

Chapter/Index: Introduction | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Appendix

Pbca (61) Space Group

Table 3016. Pbca (61) space group.

Name in the International Tables for Crystallography
Pbca P
47 mmm
Crystal system
Orthorhombic mmm
Asymm
0 ≤ x ≤ 1/2 and 0 ≤ y ≤ 1/2 and 0 ≤ z ≤ 1/2
8 Crystal symmetry Is centrosymmetric because it has -x,-y,-z in its symmetry.
Symmetry (atomic coordinates)

X, Y, Z; 1/2-X, -Y, 1/2+Z; -X, 1/2+Y, 1/2-Z; 1/2+X, 1/2-Y, -Z; -X, -Y, -Z; 1/2+X, Y, 1/2-Z; X, 1/2-Y, 1/2+Z; 1/2-X, 1/2+Y, Z

Crystal examples
(Li0.52Mg0.48)(Mg0.48Sc0.52)Si2O6: a = 18.259 Å, b = 8.883 Å, c = 5.271 Å, Z = 8.