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首页> 外文期刊>RSC Advances >Goethite (alpha-FeOOH) nanopowders synthesized via a surfactant-assisted hydrothermal method: morphology, magnetic properties and conversion to rice-like alpha-Fe2O3 after annealing
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Goethite (alpha-FeOOH) nanopowders synthesized via a surfactant-assisted hydrothermal method: morphology, magnetic properties and conversion to rice-like alpha-Fe2O3 after annealing

机译：通过表面活性剂辅助水热法合成的甲酸酯（alpha-feoOh）纳米粉末：形态，磁性，并转化为退火后的水稻类α-Fe2O3

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摘要

hydrothermal method. Their morphologies, mechanism of saturation magnetization and coercivity, and conversion to rice-like alpha-Fe2O3 after annealing are studied. It is found that the alpha-FeOOH should be synthesized at a temperature lower than 240 degrees C, and the acicular alpha-FeOOH structure actually consists of slender alpha-FeOOH nanorods. With the increase of CTAB content from 0.2 g to 0.4 g, the synthesized alpha-FeOOH nanorods become more and more slender, accompanying with the enhancement of the saturation magnetization from about 0.05 emu g(-1) to about 0.25 emu g(-1), which can be ascribed to the increase of the surface area of the alpha-FeOOH nanorods. The as-synthesized acicular alpha-FeOOH powders exhibit a large coercivity with a maximum value of about 120 kA m(-1) (similar to 1500 Oe) due to the shape anisotropy. It is also found that the acicular alpha-FeOOH powders gradually convert to rice-like alpha-Fe2O3 particles after annealing at high temperatures.
机译：水热法。 研究了它们的形态，饱和磁化机制和矫顽力，并研究了退火后的水稻样α-Fe2O3。 结果发现，α-FeOOH应在低于240℃的温度下合成，并且针状α-FeOh结构实际上由细长的α-FeOOH纳米棒组成。 随着CTAB含量从0.2g的增加，合成的α-FeOOH纳米ODS变得越来越细，随着饱和磁化强度为约0.05埃姆克（-1）至约0.25 emu g的增强（-1） ），可以归因于α-FeOOH纳米棒的表面积的增加。 由于形状各向异性，AS合成的针状α-FeOOH粉末表现出大的矫顽力，其最大值为约120ka m（-1）（类似于1500°O）。 还发现，在高温下退火后，针状α-FeOOH粉末在退火后逐渐转化为水稻α-Fe2O3颗粒。

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  • 来源
    《RSC Advances》 |2015年第34期|共6页
  • 作者

    Li Dongyun; Hu Xuzhao; Sun Yukun; Su Shubing; Xia Ailin; Ge Hongliang;

  • 作者单位

    China Jiliang Univ Coll Mat Sci &

    Engn Hangzhou 310018 Zhejiang Peoples R China;

    Anhui Univ Technol Anhui Key Lab Met Mat &

    Proc Sch Mat Sci &

    Engn Maanshan 243002 Peoples R China;

    China Jiliang Univ Coll Mat Sci &

    Engn Hangzhou 310018 Zhejiang Peoples R China;

    Ningbo Univ Technol Sch Elect &

    Informat Engn Ningbo 315016 Zhejiang Peoples R China;

    Anhui Univ Technol Anhui Key Lab Met Mat &

    Proc Sch Mat Sci &

    Engn Maanshan 243002 Peoples R China;

    China Jiliang Univ Coll Mat Sci &

    Engn Hangzhou 310018 Zhejiang Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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