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Elsevier, Journal of the European Ceramic Society, 10-11(21), p. 2047-2049

DOI: 10.1016/s0955-2219(01)00169-8

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Synthesis of SrBi2Ta2O9 (SBT) by means of a soluble Ta(V) precursor

Journal article published in 2001 by Daniel Nelis, Kristof Van Werde, Dirk Mondelaers, Geert Vanhoyland, Marlies K. Van Bael ORCID, Jules Mullens, Lucien C. Van Poucke
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Aqueous sol-gel processing of pentavalent metals like Ta and Nib is very complicated since the only water soluble compound is the oxalate, which is not very suited for gel formation. Nevertheless, starting from Ta oxalate, it is possible to prepare a water soluble Ta(V) precursor that remains stable in the pH range needed for gel formation. During synthesis the oxalate is oxidized with H2O2 and subsequently complexed with citric acid and as a result the peroxo-citrato tantalum(V) complex is formed. This Ta(V) precursor is afterwards used for the synthesis of the ferroelectric SrBi2Ta2O9 (SBT). The formation of the SBT crystalline phases was investigated by means of high temperature X-ray diffraction (HT-XRD). (C) 2001 Elsevier Science Ltd. All rights reserved.