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Tunable Synthesis of Polyhedron Bismuth Ferrite Particles via Hydrothermal Route

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Author(s): CHEN Xian-Zhi, YANG Ruo-Lin, ZHU Gang-Qiang, ZHOU Jian-Ping, LV Li, BIAN Xiao-Bing, LIU Peng

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 7;
Start page: 753;
Date: 2011;
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Keywords: tunable hydrothermal synthesis; KOH concentration and heating and cooling rate; single phase BiFeO3; formation mechanism

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 BiFeO3 particles 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¡æ/min, respectively. The rough cubo―octahedron, truncated octahedron particles were obtained by changing the cooling rate to 0.1¡æ/min. The rough truncated cubic particles with pores were obtained by changing the cooling rate to 2¡æ/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.

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