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Erschienen in:
01.03.2010
Low-temperature fabrication of BaBi2Nb2O9 ceramics by reaction controlled sintering
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 3/2010
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Abstract
Reaction controlled sintering was applied to the fabrication of BaBi2Nb2O9 (BBN) ceramics at lower temperature. A powder mixture of BaCO3 and Nb2O5 was heated at 600 °C in a 1st step calcination to produce a binary precursor of BaNb2O6. The pre-heated powder was then mixed with a fixed amount of Bi2O3, which was subsequently pressed into a disk pellet. After a powder compact of the mixture was subjected to heating at 950 °C for 4 h, a BBN bulk sample with a relative density of 92% was successfully obtained. The low-temperature fabrication of dense BBN ceramics could be attributed to the inhibited formation of an intermediate phase of Ba5 Nb4O15 and the production of submicron powder with an appropriate reactivity during a 1st step calcination.