Study on the Preparation Method of BiFeO3; by Hydrothermal Method and Its Magnetism
摘要: 采用Bi(NO3)3·5H2O和Fe(C5H7O2)3为原料,乙醇胺为碱性沉淀剂,用改进的水热法制备了BiFeO3微晶。研究了前驱体沉淀的量,矿化剂浓度以及反应温度对产物形貌,尺度以及结构的影响。采用0.005 M的前驱物溶液在180℃的反应温度下能够制备得到均匀的球形纳米颗粒。BiFeO3的尺度随反应前驱物的量增加而减小,随反应温度增加而增加。XRD研究表明在200℃的反应温度下,当前驱物的浓度低于0.005 M时都能够获得纯的BiFeO3。而TEM结构分析表明BiFeO3纳米颗粒具有完整的单畴结构;磁性分析表明纳米的BiFeO3颗粒具有弱的铁磁有序。
Abstract: An improved hydrothermal method was adopted to prepare BiFeO3 using Bi(NO3)3·5H2O, Fe(C5H7O2)3 as raw materials and 2-Aminoethanol as alkaline precipitant. The effects of the quantity of pre-cursor precipitate, the concentration of mineralizer, and the reaction temperature on the morphology of prod-ucts, size and structure were studied. The results showed that the size decreases with quantity of precursor precipitate, and increases with reaction temperature. XRD results indicated that pure BiFeO3 can be obtained by the precursor with a concentration lower that 0.005 M reacting under 200°C. TEM results indicated that the BiFeO3 nanoparticles present prefect mono-domain structure. Analyzing on magnetism showed that the BiFeO3 nanoparticles present weak antiferromagnetic order.
文章引用:刘庆生, 陈位妮, 刘红日. BiFeO3微晶的水热制备工艺及其磁性研究[J]. 材料科学, 2011, 1(3): 107-111.


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