Nano-sized BaSnO3 powder via a precursor route: Comparative study of fine and coarse-grained powders

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Paper: https://www.researchgate.net/publication/248455180_Nano-sized_BaSnO3_powder_via_a_precursor_route_Comparative_study_of_sintering_behaviour_and_mechanism_of_fine_and_coarse-grained_powders Abstract: Preparation of a very fine BaSnO3 powder by calcination of a barium tin 1,2-ethanediolato complex precursor and its sintering behaviour are described herein. A rate controlled calcination process to 820 °C leads to a nm-sized BaSnO3 powder with a specific surface area of S = 15.1m2/g (dav. = 55 nm). The powder has a slightly larger cell parameter of a = 412.22(7) pm compared to the single crystal value, which decreases with increasing calcination temperature and reaches the reference value above 1000 °C. The sintering behaviour is compared between fine and coarsegrained BaSnO3 powders. Corresponding powder compacts of the nano-sized BaSnO3 achieve a relative density of 90% after sintering at 1600 °C for 1 h and at 1500 °C and a soaking time of 30 h, whereas coarse-grained powder compacts reach only 80% of the relative density at 1650 °C (10 h). Furthermore, the shrinkage mechanisms of fine and coarse-grained powder compacts have been investigated and are discussed.

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