Nano-Sized BaSnO3 Powder Via a Precursor Route. Comparative Study of Sintering Behaviour and Mechanism of Fine and Coarse-Grained Powders
Journal of the European Ceramic Society 29 (2009) 2317–2324 (doi:10.1016/j.jeurceramsoc.2009.01.026)
24 Pages Posted: 24 Jul 2018
Date Written: July 2, 2009
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 = 15.1 m2/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 coarse-grained 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 coarsegrained powder compacts have been investigated and are discussed.
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