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›› 2002, Vol. 2 ›› Issue (4): 0-0.

• 4 •    

钙钛矿型铋铁氧体纳米微粒的弱铁磁性

何海英，寇昕莉，李建功   

  1. 兰州大学材料科学与工程研究所，甘肃 兰州 730000
  • 出版日期:2002-08-20 发布日期:2002-08-20

Weak Ferromagnetism in Perovskite-type Bismuth Ferrite Nanoparticles

HE Hai-ying, KOU Xin-li, LI Jian-gong   

  1. Institute of Chemical Metallurgy, Chinese Academy of Sciences, Beijing 100080，China
  • Online:2002-08-20 Published:2002-08-20

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被引次数

27

摘要： 采用溶胶-凝胶法制备了不同粒径的纯净单相钙钛矿型BiFeO3纳米微粒. X射线衍射分析表明，BiFeO3纳米微粒仍为菱方结构，但晶格畸变随颗粒尺寸的减小而增大. 磁测量显示，BiFeO3纳米微粒具有明显弱铁磁性，且弱铁磁性随温度升高显著降低. 弱铁磁性的自发磁化强度随温度升高呈线性下降，磁化强度和磁化率均随颗粒尺寸的减小而增大. 穆斯堡尔谱分析揭示，颗粒愈小，自旋倾角愈大，其分布也愈宽. 从纳米微粒小尺寸效应和表面效应入手，讨论了BiFeO3纳米微粒结构与磁结构和弱铁磁性的关系.

关键词: 铁氧体, 纳米微粒, 弱铁磁性

Abstract: The effects of modifiers on the extraction of cobalt(II) and iron(II) with tertiary amine were investigated. It was found that additional modifiers, oxygen-containing organic compound(HA3), had the synergism with tertiary amine for cobalt extraction and also changed the property of the iron extraction. The loaded iron(II) can not be stripped by dilute acidic solution. Cobalt(II) and iron(II) could be separated by using scrubbing and stripping. The new technology of separation of cobalt(II) and iron(II) extractive, with tertiary amine from chloride solution was proposed, which avoids the preoxidation of iron(II).

Key words: ferrite, nanoparticle, weak ferromagnetism

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