On the transition temperatures of BaCO3 and SrCO3 as DTA temperature reference materials

Elucidating the role of earth alkaline doping in perovskite-based methane dry reforming catalysts

“…It is known that orthorhombic SrCO 3 (the stable modification under ambient conditions) undergoes a structural transition into rhombohedral SrCO 3 upon heating, but the occurrence of rhombohedral SrCO 3 at around 800 °C is well below the orthorhombic-to-rhombohedral transformation temperature (∼900 °C). 48–51 The decomposition of rhombohedral SrCO 3 upon re-cooling is in accordance with the literature, as the transformation is reversible and rhombohedral SrCO 3 cannot be quenched to room temperature. 49…”

Synthesis of BaZr0.75Hf0.25O3 by a solid-state reaction technique and characterizations of dielectric properties

“…Beyond 1153 • C, no DSC peak is discernible nor has any further significant weight loss occurred in the mixture up to ∼1200 • C. It was speculated that a partial BaZrO 3 -BaHfO 3 can form if the mixture is dried over 630 • C. Azad and Subramaniam successfully synthesized crystalline BaZrO 3 powder at a relatively low temperature of between 700 and 800 • C using nitrate precursors (Barium nitrate and zirconyl nitrate) [13]. However, this results are not consistent with the work of Iwafuchi et al [14], they found that the decomposition temperature of BaCO 3 was above 1000 • C (e.g. 1350 • C for BaCO 3 ).…”

Preparation and characterization of hafnium doped barium titanate ceramics

“…850 • C). Lower decomposition tem- peratures were found in these literatures between 800 and 976 o C [9,10].…”