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

Autor:	M. K. Van Bael, D. Mondelaers, D. Nelis, L.C. Van Poucke, K. Van Werde, G. Vanhoyland, Jules Mullens
Rok vydání:	2001
Předmět:	Aqueous solution Materials science Inorganic chemistry Tantalum chemistry.chemical_element Ferroelectricity Oxalate chemistry.chemical_compound Water soluble chemistry Materials Chemistry Ceramics and Composites Ph range Citric acid
Zdroj:	Journal of the European Ceramic Society. 21:2047-2049
ISSN:	0955-2219
DOI:	10.1016/s0955-2219(01)00169-8
Popis:	Aqueous sol-gel processing of pentavalent metals like Ta and Nb 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 H 2 O 2 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 SrBi 2 Ta 2 O 9 (SBT). The formation of the SBT crystalline phases was investigated by means of high temperature X-ray diffraction (HT–XRD).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fb9bae1ea86a559484d1f5686c436349 https://doi.org/10.1016/s0955-2219(01)00169-8 Zobrazit plný text záznamu Full Text from ScienceDirect