کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1294850 | 973639 | 2011 | 5 صفحه PDF | دانلود رایگان |
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 behavior 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.
► Novel and eco-friendly synthesis route for BaCeO3 using starch.
► Monitoring the phase evolution during the synthesis.
► Nanoscaled and phase-pure BaCeO3 powder with high sintering activity.
► Dense ceramic bodies even at 1450 °C without any sintering additive.
Journal: Solid State Ionics - Volume 203, Issue 1, 16 November 2011, Pages 52–56