The coexistence of Zr-and Ti-rich perovskites suggests a very limited miscibility of these phases, which agrees with data reported by Hkiri et al. . From the synthesis of nominal CaZr0.5Ti0.5O3, it became clear that the CaTiO3 and CaZrO3 phases, which are formed during the solid-state synthesis of BCZT, do not mix in a full solid solution and only little CaZrTi₂O₇ is present.