Tunable Synthesis of Polyhedron Bismuth Ferrite Particles via Hydrothermal Route

doi:10.3724/SP.J.1077.2011.00753

Abstract

Abstract: Bismuth ferrite (BiFeO₃) powders were hydrothermally synthesized by using Bi(NO)₃^.5H₂O and Fe(NO)₃^.9H₂O as starting materials, and KOH used as a mineralizer. The large-scale polyhedral BiFeO₃particles were obtained by controlling KOH concentration, heating and cooling rate. It was found that the large-scale polyhedral BiFeO₃ particles were synthesized favorably at the high KOH concentrations and an appropriate cooling rate was an important factor for synthesis of high crystallinity BiFeO₃ particles. The quasi-cubic and truncated cubic particles of high crystallinity were obtained at the KOH concentration of 6 and 8 mol/L with the cooling rate of 0.2℃/min, respectively. The rough cubo-octahedron, truncated octahedron particles were obtained by changing the cooling rate to 0.1℃/min. The rough truncated cubic particles with pores were obtained by changing the cooling rate to 2℃/min. Morphologies evolution of large-scale polyhedron bismuth ferrite particles were observed by scanning electron microscope. The formation mechanism of the regular morphologies was also discussed.

Key words: tunable hydrothermal synthesis, KOH concentration and heating and cooling rate, single phase BiFeO₃, formation mechanism

CLC Number:

O782

CHEN Xian-Zhi, YANG Ruo-Lin, ZHU Gang-Qiang, ZHOU Jian-Ping, LV Li, BIAN Xiao-Bing, LIU Peng. Tunable Synthesis of Polyhedron Bismuth Ferrite Particles via Hydrothermal Route[J]. Journal of Inorganic Materials, 2011, 26(7): 753-758.

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