Figure 1
(Top) oP and (bottom) oC unit cells, seen in projection along [001]. The first plane of the (h00) family passes through the lattice node 100 in the case of oP but through the lattice node in the case of oC, so that the intersection with the a axis is at 1 in the former but at in the latter. Consequently, h is reduced to 1 and 2, respectively, and the two families of lattice planes are indicated as (100) and (200). |