\r王 为，张立静，孟 旭，王益成\r
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AuthorsHTML:\r王 为，张立静，孟 旭，王益成\r
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AuthorsListE:\rWang Wei，Zhang Lijing，Meng Xu，Wang Yicheng\r
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AuthorsHTMLE:\rWang Wei，Zhang Lijing，Meng Xu，Wang Yicheng\r
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Unit:\r天津大学化工学院，天津 300350\r
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Unit_EngLish:\rSchool of Chemical Engineering and Technology，Tianjin University，Tianjin 300350，China\r
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Abstract_Chinese:\r采用水热法，以柠檬酸(Cit)为配位剂，使之与溶液中的亚铁离子形成配合物，通过改变水热反应时间合成出具有不同形貌和高饱和磁化强度的Fe3O4 磁性粉体，以研究水热反应时间对合成Fe3O4 磁性颗粒形貌及其磁性能的影响，从而确定最佳合成工艺．XRD 衍射谱图分析结果表明柠檬酸配位体系水热合成产物为具有高纯度的面心立方结构的Fe3O4 粉末；SEM 图分析结果表明，随着反应时间的增加，Fe3O4 的形状由正八面体消失，并先择优取向横向生长成纳米片结构，随后逐渐趋向于纵向生长，使片状生长为块状，最终生长为不规则的多面体结构．FT-IR 分析结果表明，在柠檬酸体系合成Fe3O4的过程中，柠檬酸分子在合成的Fe3O4颗粒表面以配位状态存在．磁滞曲线分析结果表明，合成的Fe3O4样品具有超顺磁性，且当水热反应时间为14 h 时，合成的Fe3O4粉体在300 K 条件下饱和磁化强度高达97 emu/g，相比目前文献报道的最高的块状结构Fe3O4颗粒饱和磁化强度提高7.78%．\r
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Abstract_English:\rFe3O4 powders with various morphologies and high magnetism were synthesized by controlling the reaction time of the hydrothermal process with the coordination of iron(Ⅱ) ion and citric acid(Cit). The influence of the reaction time on the morphology and magnetism of Fe3O4 synthesis was investigated，and the optimized synthesis protocol was determined. The XRD patterns showed that the products synthesized in the iron(Ⅱ)-Cit system were facecentered-cubic Fe3O4 powders of high purity. The SEM images illustrated that, with the increase of reaction time, octahedral Fe3O4 particles disappeared and grains exhibited lateral growth to form a nanoplate, and longitudinal growth to form a bulk structure and finally an irregular polyhedron structure. The FT-IR spectra indicated that coordinated Cit molecules existed on the surface of Fe3O4 particles. The hysteresis curves of the products showed that the maximum saturation magnetization of up to 97 emu/g at 300 K was observed at the hydrothermal reaction time of 14 h, which was 7.78% higher than that of the corresponding bulk Fe3O4.\r
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Keyword_Chinese:Fe₃O₄颗粒；水热反应；形貌；饱和磁化强度

Keywords_English:Fe3O4 particle；hydrothermal reaction；morphology；saturation magnetization\r


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