Fabrication and Properties of Highly Pure BiFeO3 Using A Method of Solid State Reaction-molten Salt Synthesis with Non-equilibrium Process

doi:10.15541/jim20130603

Abstract

Abstract:

High pure Bismuth ferrite (BiFeO₃) powders were prepared by a solid state reaction-molten salt synthesis method (SSR-MSS method) using shock heating and chilling non-equilibrium process (SHCN process). The structure, morphology and electromagnetic properties were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscope (FTIR), Thermogravimetry-Differential Scanning Calorimetry (TG-DSC) and Vibrating Sample Magnetometer (VSM). The results indicated that SHCN process was better to get higher purity of BiFeO₃ powders than conventional equilibrium process (C process), but still has a certain number of impurity phases like Bi₂₅FeO₃₉ and/or Bi₂Fe₄O₉ as found in the products prepared by either SSR-SHCN process or MSS-SHCN process. In contrast, single-phase BiFeO₃ powders could be obtained by SSR-MSS-SHCN process. The micro-nanoscale BiFeO₃ powders presented antiferromagnetism, superparamagnetism, and/or weak ferromagnetism behavior at room temperature, but not spin-glass state at low temperature (5 K).

Key words: BiFeO3, solid state reaction-molten salt synthesis method, shock heating &amp, chilling non-equilibrium process

CLC Number:

TB34

WU Xing, LI Hai-Feng, ZHOU Jin-Ling, HUO Min-Feng, CHENG Cheng, SHEN Xu-Gen, YAN Chun-Jie. Fabrication and Properties of Highly Pure BiFeO₃ Using A Method of Solid State Reaction-molten Salt Synthesis with Non-equilibrium Process[J]. Journal of Inorganic Materials, 2014, 29(11): 1151-1155.

Figures/Tables 9

Fig. 1 XRD patterns of samples prepared by of SSR-SHCN method after being calcinated at 700℃ for different soaking time (1)15 min; (b) 30 min; (c) 60 min; (d) 90 min; (e) 120 min

Fig. 2 XRD patterns of samples prepared by MSS-SHCN method after being calcinated at 700℃ for different soaking time (a) 15 min; (b) 30 min; (c) 60 min; (d) 120 min; (e) 240 min

Fig. 3 XRD patterns of SSR-MSS-SHCN method calcinated samples for different soaking time (a) 15 min; (b) 30 min; (c) 60 min; (d) 90 min; (e) 120 min

Fig. 4 XRD patterns of the samples prepared by (a) SSR- MSS-C method; (b) SSR-MSS-SHCN method

Fig. 5 FT-IR spectrum of as-synthetized BiFeO3 by using SSR-MSS-SHCN method

Fig. 6 TG-DSC curves of as-synthetized BiFeO3 by using SSR-MSS-SHCN method

Fig. 7 Dielectric spectra of as-prepared BiFeO3 by using SSR-MSS-SHCN method

Fig. 8 M-H hysteresis loops of as-synthetized BiFeO3 by using SSR-MSS-SHCN at 5 K and 300 K (a), and insets are the partially enlarged curves at 300 K (b) and 5 K (c), respectively

Fig. 9 SEM images of BiFeO3 powder prepared by SSR- SHCN method (a) and SSR-MSS-SHCN method (b)

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Fabrication and Properties of Highly Pure BiFeO₃ Using A Method of Solid State Reaction-molten Salt Synthesis with Non-equilibrium Process

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