Figure 5.1.3.9

Arnold, H.

doi:10.1107/97809553602060000510

International
Tables for
Crystallography
Volume A
Space-group symmetry
Edited by Th. Hahn

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International Tables for Crystallography (2006). Vol. A. ch. 5.1, p. 85

Figure 5.1.3.9

H. Arnold^a ^‡

^a Institut für Kristallographie, Rheinisch-Westfälische Technische Hochschule, Aachen, Germany

Figure 5.1.3.9

Rhombohedral lattice with a triple hexagonal unit cell a, b, c in obverse setting (i.e. unit cell a₁, b₁, c in Fig. 5.1.3.6c) and the three centred monoclinic cells. (a) C-centred cells $[C_{1}]$ with $[a_{1}, b_{1}, c]$ ; $[C_{2}]$ with $[a_{2}, b_{2}, c]$ ; and $[C_{3}]$ with $[a_{3}, b_{3}, c]$ . The unique monoclinic axes are $[b_{1}, b_{2}]$ and $[b_{3}]$ , respectively. Origin for all four cells is the same. (b) A-centred cells $[A_{1}]$ with $[a', b_{1}, c_{1}]$ ; $[A_{2}]$ with $[a', b_{2}, c_{2}]$ ; and $[A_{3}]$ with $[a', b_{3}, c_{3}]$ . The unique monoclinic axes are $[c_{1}]$ , $[c_{2}]$ and $[c_{3}]$ , respectively. Origin for all four cells is the same.