水热环境下磁场对BiFeO3形貌和性能的影响

doi:10.7503/cjcu20150464

摘要/Abstract

摘要：

以Bi(NO₃)₃·5H₂O和Fe(NO₃)₃·9H₂O为反应原料, KOH为矿化剂, 通过在碱浓度为2~7 mol/L、反应温度为140~220 ℃的磁场水热反应系统中保温1~12 h制备了BiFeO₃粉体. 研究发现, 外加磁场可以拓宽合成纯相BiFeO₃的碱浓度和反应温度范围, 更易得到纯相铁酸铋粉体. SEM观测结果表明, 通过改变磁场强度可有效控制BiFeO₃粉体的颗粒尺寸及形貌: 随着磁场的增强, BiFeO₃的颗粒尺寸逐渐减小. 随着颗粒尺寸的减小, 其光催化活性增强. 磁场下得到的粉体表现出较强的磁性, Raman散射中A₁-2振动模式异常增强.

关键词: 水热法, 多铁性材料, BiFeO₃, 磁场

Abstract:

BiFeO₃ powders were synthesized by hydrothermal method under different magnetic fields with KOH concentrations of 2—7 mol/L at 140—220 ℃ for 1—12 h, using Bi(NO₃)₃·5H₂O and Fe(NO₃)₃·9H₂O as reaction materials and KOH as the mineralizer. The external magnetic field expanded the experimental range of alkali concentration and reaction temperature for the synthesis of pure BiFeO₃ phase. SEM images showed that the magnetic field effectively reduced the BiFeO₃ particle size. The results of photocatalytic experiment showed that the photocatalytic activity of the BiFeO₃ powders increased with decreasing particle size. The magnetization was increased and the intensity of A₁-2 resonance mode in Raman spectra was enhanced for BiFeO₃ prepared under mangetic field.

Key words: Hydrothermal method, Multiferroics, BiFeO₃, Magnetic field

中图分类号:

O611.3

TrendMD:

师旋旋, 肖瑞娟, 王振, 周剑平, 边小兵. 水热环境下磁场对BiFeO₃形貌和性能的影响. 高等学校化学学报, 2015, 36(12): 2364.

SHI Xuanxuan, XIAO Ruijuan, WANG Zhen, ZHOU Jianping, BIAN Xiaobing. Effects of Magnetic Field on the Morphology and Properties of BiFeO₃ Synthesized by Hydrothermal Method^†. Chem. J. Chinese Universities, 2015, 36(12): 2364.

图/表 9

Fig.1 XRD patterns of samples synthesized at 200 ℃ for 3 h with different KOH concentrations under magnetic fields of 0(A), 120 mT(B) and 240 mT(C) c(KOH)/(mol·L-1): a. 2; b. 3; c. 4; d. 5; e. 6; f. 7.

Fig.2 SEM images of samples synthesized at 200 ℃ for 3 h with c(KOH) of 4(A1—A3), 5(B1—B3) and 6 mol/L(C1—C3) under magnetic fields of 0(A1, B1, C1), 120 mT(A2, B2, B2), 240 mT(A3, B3, C3)

Fig.3 XRD patterns of samples synthesized at 140—220 ℃ for 3 h with c(KOH) of 4 mol/L under magnetic fields of 0(A), 120 mT(B) and 240 mT(C) Temperature/℃: a. 140; b. 150; c. 180; d. 200; e. 220.

Fig.4 SEM images of samples synthesized at temperature of 150 ℃(A1—A3), 180 ℃(B1—B3) and 200 ℃(C1—C3) for 3 h with c(KOH) of 4 mol/L under 0(A1, B1, C1), 120 mT(A2, B2, C2) and 240 mT(A3, B3, C3)

Fig.5 XRD patterns of samples synthesized at 200 ℃ with c(KOH) of 5 mol/L for different reaction time under magnetic fields of 0(A), 120 mT(B) and 240 mT(C) Reaction time/h: a. 1; b. 2; c. 3; d. 6; e. 9; f. 12.

Fig.6 SEM images of samples synthesized at 200 ℃ for 2 h(A1—A3), 6 h(B1—B3) and 9 h(C1—C3) with c(KOH) of 5 mol/L under magnetic fields of 0(A1, B1, C1), 120 mT(A2, B2, C2) and 240 mT(A3, B3, C3)

Fig.7 Photocatalytic degradation of MB over BiFeO3 powders synthesized at 200 ℃ for 3 h with c(KOH) of 4 mol/L(A) and 5 mol/L(B) under different magnetic fields

Fig.8 Magnetic hysteresis loops of samples synthesized at 200 ℃ for 3 h with c(KOH) of 4 mol/L(A) and 5 mol/L(B) under different magnetic fields

Fig.9 Raman spectra of samples synthesized at 200 ℃ for 3 h with c(KOH) of 5 mol/L under magnetic fields of 0(a), 120 mT(b) and 240 mT(c)

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水热环境下磁场对BiFeO₃形貌和性能的影响

Effects of Magnetic Field on the Morphology and Properties of BiFeO₃ Synthesized by Hydrothermal Method^†

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