(a) Confirm that the unit cell for perovskite shown in Fig. 6.24a 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, hi 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.
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