Preparation and characterization of nanosized SrBi2Nb2O9 powder by the combustion synthesis
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Data
2003-06-01
Autores
Zanetti, S. M.
Santiago, E. I.
Bulhoes, LOS
Varela, José Arana [UNESP]
Leite, E. R.
Longo, Elson [UNESP]
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Elsevier B.V.
Resumo
This work presents the preparation of SrBi2Nb2O9 (SBN) directly by the combustion synthesis. Strontium nitrate, niobium ammonium oxalate (NH4H2[NbO-(C2O4)(3)].3H(2)O) and bismuth oxide were used as oxidant reactants and urea as fuel. The influence of the fuel was evaluated by the addition of different fuel amounts (50%, 100%, 200% and 300%), 100% being the stoichiometric proportion. The XRD patterns showed that the SBN perovskite crystallized as the majority phase. The as-synthesized stoichiometric powder presented a specific surface area of around 13 m(2)/g and a mean grain size of around 16 nm. Dilatometric measurements showed that the maximum sintering rate occurs at 1275degreesC. The determination of the ferroparaelectric transition showed a Curie temperature (T-c) of 429degreesC. (C) 2002 Elsevier B.V. B.V. All rights reserved.
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combustion synthesis, SrBi2Nb2O9, powder, ferroelectric, bismuth layer
Como citar
Materials Letters. Amsterdam: Elsevier B.V., v. 57, n. 19, p. 2812-2816, 2003.