Effect of chemical modifiers on thermal evolution of SBT precursors powders.

M. STACHIOTTI; R. MACHADO; A. FRATTINI; N. PELLEGRI; O. DE SANCTIS

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY

Año: 2005 vol. 36 p. 53 - 60

0928-0707

The effects of the chelating agent on the thermal evolution of SrBi2Ta2O9 precursor powders wereinvestigated. The precursor solutions were prepared from non-hydrolyzing precursors of bismuth and strontium and a tantalum alkoxide. The utilization of diethanolamine or triethanolamine as chelating agent was found to produce the segregation of metallic bismuth in the as-prepared powders, which led to the formation of a multiphase system. On the other hand, acetoin, one of the á-hydroxyketones, showed outstanding characteristics for the low-temperature synthesis of SrBi2Ta2O9: elimination of residual organics at low temperature, an earlier onset of crystallization, and no segregation of secondary phases during the whole crystallization process.2Ta2O9 precursor powders wereinvestigated. The precursor solutions were prepared from non-hydrolyzing precursors of bismuth and strontium and a tantalum alkoxide. The utilization of diethanolamine or triethanolamine as chelating agent was found to produce the segregation of metallic bismuth in the as-prepared powders, which led to the formation of a multiphase system. On the other hand, acetoin, one of the á-hydroxyketones, showed outstanding characteristics for the low-temperature synthesis of SrBi2Ta2O9: elimination of residual organics at low temperature, an earlier onset of crystallization, and no segregation of secondary phases during the whole crystallization process.