Influence of sinthesis conditions on the microstructure of proton-conducting ceramic materials based on BaCeO${}_3$

The present work concentrates on a comparative analysis of methods for the synthesis of materials based on barium cerate at relatively low sintering temperatures. According to the data of thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), the optimal temperatures of powder synthesis are determined. Using the qualitative X-ray phase analysis, it is found that at 1423 K BaCe${}_{0.9}$M${}_{0.1}$O${}_{3-\delta}$ compounds obtained by the citrate-nitrate method, are isomorphic to the perovskite-type structure (an orthorhombic distortion). For the studied ceramic samples obtained by different methods, the relative density and open porosity were determined at 1423 and 1623 K.