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Titel (primär) Sintering of a fine-grained BaCeO3 powder obtained from a co-precipitation method
Autor Köferstein, R.; Jäger, L.; Ebbinghaus, S.G.;
Journal / Serie Journal of Materials Science
Erscheinungsjahr 2010
Department TUCHEM;
Band/Volume 45
Heft 23
Sprache englisch;
Abstract The formation of BaCeO3 by a co-precipitation method is described herein. The co-precipitation route leads to an orange (BaCe)-precursor powder (1). To improve the sintering behaviour, a small amount of Ge4+ was incorporated, leading to a (BaCe0.95/Ge0.05)-precursor (2). Both precursor powders results in fine-grained preceramic powders (1A, 2A) after calcination. The shrinkage and sintering behaviour of resulting powder compacts were studied in comparison to a coarse-grained mixed-oxide BaCeO3 powder (3). Compacts of 2A reach a relative density of 90% after sintering at 1350 °C with grain sizes between 0.9 and 3.2 µm. On the other hand ceramics of 1A and 3 have, after sintering at 1500 °C (10 h), relative densities of 85 and 76%, respectively. Ceramic bodies of 1A consisted of phase-pure orthorhombic BaCeO3, whereas bodies of 2A show reflections of BaCeO3 and a Ba2GeO4 phase. DTA investigations of samples 1A and 2A reveal three phase transitions at 255 °C (1A) and 256 °C (2A) as well as 383 °C (1A) and 380 °C (2A). A very weak one can be obtained in the range 880-910 °C.
ID 10193
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=10193
Köferstein, R., Jäger, L., Ebbinghaus, S.G. (2010):
Sintering of a fine-grained BaCeO3 powder obtained from a co-precipitation method
J. Mater. Sci. 45 (23), 6521 - 6527