Synthesis and Characterization of a Nano-Scaled Barium Cerate Perovskite Powder Using Starch As Polymerization Agent
Solid State Ionics 203 (2011) 52–56
17 Pages Posted: 23 Jan 2018
Date Written: November 16, 2011
The preparation of nano-sized BaCeO3 powder using starch as a polymerization agent is described herein. Phase evolution during the decomposition process of a (BaCe)-gel was monitored by XRD. A phase-pure nano-sized BaCeO3 powder was obtained after calcining of the (BaCe)-gel at 920 °C. The resulting powder has a specific surface area of 15.4 m2/g. TEM investigations reveal particles mainly in the size range of 30 to 65 nm. The shrinkage and sintering behaviour of resulting powder compacts were studied in comparison to a coarse-grained mixed-oxide BaCeO3 powder (SBET = 2.1 m2/g). Dilatometric measurements show that the beginning of shrinkage of compacts from the nano-sized powder is downshifted by 300 °C compared to mixed-oxide powder. Compacts from the nano-sized powder reach a relative density of 91 % after sintering at 1450 °C for 10 h.
Keywords: BaCeO3, perovskites, nano, sintering, starch
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