Co-precipitation/hydrothermal synthesis of BiFeO₃ powder

Abstract

A coprecipitation/hydrothermal route was utilized to fabricate pure phase BiFeO₃ powders using FeCl₃·6H₂O and Bi(NO₃)₃·5H₂O as starting materials, ammonia as precipitant and NaOH as mineralizer. The synthesized powders were characterized by XRD, SEM and DSC-TG analysis. In the process, single-phase BiFeO₃ powders could be obtained at a hydrothermal reaction temperature of 180 °C, with NaOH of 0.15 mol/L, in contrast to 200 °C and 4 mol/L for conventional hydrothermal route. Meanwhile, the micro-morphology of synthesized BiFeO₃ powders changed with different reaction temperatures and concentrations of NaOH. The Néel temperature, Curie temperature and decomposition temperature of the synthesized BiFeO₃ powders were detected to be 301 °C, 828 °C and 964 °C, respectively. The hydrothermal reactions mechanism to fabricate BiFeO₃ powders were discussed based on the in-situ transformation process.

Keywords

co-precipitation / hydrothermal synthesis / bismuth ferrite powders / multiferroics

References

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