(a) Confirm that the unit cell for perovskite shown in Fig. 6.26a is consistent with the stoichiometry CaTiO₃.

(b) A second unit cell can be drawn for perovskite. This has Ti(IV) at the centre of a cubic cell; Ti(IV) is in an octahedral environment with respect to the O²⁻ ions. In what sites must the Ca²⁺ ions lie in order that the unit cell depicts the correct compound stoichiometry? Draw a diagram to illustrate this unit cell.

Figure 6.26a

Transcribed Image Text:

(a)