“…The powders prepared this way maintain several drawbacks, like a lack of reproducibility, a large particle size, wide size distribution, strong agglomeration and chemical inhomogeneity. It is difficult to obtain dense ceramics (∼95% of theoretical density) below a sintering temperature of 1600 • C. The CaZrO 3 -based samples with CaO inclusions applied by Janke, as solid electrolytes in electrochemical oxide probes, showed a significant porosity (15-20%) depending on chemical composition and sintering temperature (1600-1800 • C) [15]. Moreover, at temperatures higher than 1750 • C unfavourable microstructural changes can occur due to phase transition of the orthorhombic CaZrO 3 to the cubic form [16].…”