Preparation and characterization of nanosized SrBi2Nb2O9 powder by the combustion synthesis

Strontium nitrate, niobium ammonium oxalate (NH4H2[NbO-(C2O4)3].3H2O) and bismuth oxide were used as oxidant reactions and urea as fuel. The influence of the fuel was evaluated by the addition of different amounts (50%, 100%, 200% and 300%), 100% being the stoichiometric proportion. The XRD patterns...

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Veröffentlicht in:	Materials letters 2003-06, Vol.57 (19), p.2812-2816
Hauptverfasser:	ZANETTI, S. M, SANTIAGO, E. I, BULHOES, L. O. S, VARELA, J. A, LEITE, E. R, LONGO, E
Format:	Artikel
Sprache:	eng
Schlagworte:	Chemistry Colloidal state and disperse state Cross-disciplinary physics: materials science rheology Exact sciences and technology General and physical chemistry Materials science Nanoscale materials and structures: fabrication and characterization Physics Powders
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Zusammenfassung:	Strontium nitrate, niobium ammonium oxalate (NH4H2[NbO-(C2O4)3].3H2O) and bismuth oxide were used as oxidant reactions and urea as fuel. The influence of the fuel was evaluated by the addition of different amounts (50%, 100%, 200% and 300%), 100% being the stoichiometric proportion. The XRD patterns showed that the SBN perovskite crystallised as the majority phase. The as-synthesised stoichiometric powder presented a specific surface area of around 13 m2/g and a mean grain size of around 16 nm. Dilatometric measurements showed that the maximum sintering rate occurred at 1275 C. The determination of the ferroparaelectric transition showed a Curie temperature (Tc) of 429 C. 9 refs.
ISSN:	0167-577X 1873-4979
DOI:	10.1016/S0167-577X(02)01380-0