Effect of Magnetic Field on Synthesis of Nano-FeOOH by Low-Temperature Neutralization Method

• 作 者: ZHONG Yun-bo SUN Zong-qian TANG Nie-wei XU Bin FU Xiao-ming WANG Jiang
• 机 构: Shanghai Key Laboratory of Modern Metallurgy and Material Processing,Shanghai University,
• 出 处: Journal of Iron and Steel Research(International)
• 发表日期: 2012年S2期
• 关键词: FeOOH hundreds hydroxide susceptibility producing broken vibrating raised nitrat

Using XRD,TEM and VSM methods,the phase,morphology and magnetic property of iron hydroxide oxide(FeOOH)which has been prepared by low-temperature neutralization reaction under different magnetic fields were analyzed.It can be found that the magnetic field had a great influence on the product.Acicular goethite(α-FeOOH)was synthetized without magnetic field.When the magnetic flux density was increased to 0.1T,γ-FeOOH was obtained.If the magnetic field intensity was raised to 0.5T,the product was all composed ofσ-FeOOH.Moreover,the crystallization of FeOOH was greatly influenced by magnetic field as well.Thermodynamic calculation results show that the magnetic free energy of chemical reaction reached to more than hundreds KJ/mol when the magnetic field is applied.It meaned that the application of magnetic field was conducived to producing the products with higher susceptibility.Even under the low magnetic field,due to the stability of the reaction products was broken by the magnetic field,the magnetic free energy was also effective.

Using XRD, TEM and VSM methods, the phase, morphology and magnetic property of iron hydroxide oxide (FeOOH) which has been prepared by low-temperature neutralization reaction under different magnetic fields were analyzed. It can be found that the magnetic field had a great influence on the product. Acicular goethite (α-FeOOH) was synthetized without magnetic field. When the magnetic flux density was increased to 0.1T, γ-FeOOH was obtained. IF the magnetic field intensity was raised to 0.5T, the product was all composed ofσ-FeOOH.Moreover, the crystallization of FeOOH was greatly influenced by the magnetic field as well. Thermodynamic calculation results show that the magnetic free energy of chemical reaction reached to more than hundreds KJ / mol when the magnetic field is applied. It meaned that the application of magnetic field was conducived to producing the products with higher susceptibility. Even under the low magnetic field, due to the stability of the reaction products was broken by the magnetic fi eld, the magnetic free energy was also effective.