Effect of chemical modifiers on thermal evolution of SBT precursors powders

MARCELO STACHIOTTI; RODRIGO MACHADO; AGUSTIN FRATTINI; NORA PELLEGRI; OSCAR DE SANCTIS

FERROELECTRICS

Taylor & Francis

Año: 2006 vol. 335 p. 23 - 33

0015-0193

The effects of the chelating agent on the thermal evolution of SrBi2Ta2O9 precursor powders were investigated. The precursor solutions were prepared from non-hydrolyzing precursors of bismuth and strontium and a tantalum alkoxide. The utilization of alkanolamines 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 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. temperature, an earlier onset of crystallization, and no segregation of secondary phases during the whole crystallization process. powders were investigated. The precursor solutions were prepared from non-hydrolyzing precursors of bismuth and strontium and a tantalum alkoxide. The utilization of alkanolamines 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 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. temperature, an earlier onset of crystallization, and no segregation of secondary phases during the whole crystallization process. 2Ta2O9 precursor powders were investigated. The precursor solutions were prepared from non-hydrolyzing precursors of bismuth and strontium and a tantalum alkoxide. The utilization of alkanolamines 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 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. temperature, an earlier onset of crystallization, and no segregation of secondary phases during the whole crystallization process. 2Ta2O9: elimination of residual organics at low temperature, an earlier onset of crystallization, and no segregation of secondary phases during the whole crystallization process. Keywords SBT; precursor powders; stoichiometrySBT; precursor powders; stoichiometry