Furthermore, diffraction peaks of a CaZrTi2O7 intermediate phase with low crystallinity are visible (Figure ) and overlap with the main reflections of ZrO2. For a closer examination of this reaction step, raw powder mixtures with the nominal composition CaZr0.5Ti0.5O3 were calcined at 800 °C and 1200 °C, and analyzed using XRD (Figure ). After cooling the powder mixture from 800 °C, CaTiO3 and CaZrO3 existed as separate phases, along with TiO2 (rutile), CaCO3, ZrO2, and the intermediate phase CaZrTi₂O₇. No reflections from non-perovskite-type phases were found in the sample calcined at 1200 °C and Zr-rich and Ti-rich perovskites were once again distinctly separated.