Effects of the chemical modifier on the thermal evolution of SrBi2Ta2O9 precursor powders

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

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY

Springer

Año: 2005 vol. 36 p. 53 - 60

0928-0707

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 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, andno segregation of secondary phases during the whole crystallization process.