Figure 1
Tilting of regular octahedra about the xPC and yPC axes, as in space group Pbnm. Pseudocubic axes xPC, yPC and zPC are directed parallel to orthorhombic vectors ,
[110 ] and [001], respectively. (a) Tilting around the yPC axis (in clinographic projection) with θy the angles of inclination of stalks of length s to the axis; (b) Tilting around the zPC axis (head-on view showing mirror planes); (c) yPC-axis tilting [as in (a)] viewed along the yPC axis towards the origin; (d) zPC-axis tilting [as in (b)] viewed along the zPC axis towards the origin. |