Zanetti, S. M.Santiago, E. I.Bulhoes, LOSVarela, José Arana [UNESP]Leite, E. R.Longo, Elson [UNESP]2014-05-202014-05-202003-06-01Materials Letters. Amsterdam: Elsevier B.V., v. 57, n. 19, p. 2812-2816, 2003.0167-577Xhttp://hdl.handle.net/11449/39165This 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.2812-2816engcombustion synthesisSrBi2Nb2O9powderferroelectricbismuth layerArtigo10.1016/S0167-577X(02)01380-0WOS:000183268500009Acesso restrito