| SiO2/α-FeOOH和SiO2/γ-Fe2O3微粒的界面研究 |
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| 引用本文： | 朱以华,李春忠,胡黎明.SiO2/α-FeOOH和SiO2/γ-Fe2O3微粒的界面研究[J].物理化学学报,1995,11(9):860-864. |
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| 作者姓名： | 朱以华 李春忠 胡黎明 |
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| 作者单位： | East China University of Science and Technology,Institute of Technical Chemical Physics,Shanghai 200237 |
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| 摘 要： | α－FeOOH微粒由于其表面高活性，在转变成γ－Fe2O3的热处理过程中容易烧结，一旦这种烧结现象发生，得到的γ－Fe2O3磁粉磁性能大大下降1]．为了克服这一困难，目前采用在α-FeOOH微粒表面包敷有机物2]和无机物3]来隔离颗粒，阻止其聚集．其中SiO2表面包敷处理是最令人感兴趣的研究课题之一4，5]．SiO2是一种难烙性的非磁性材料，它包敷在α-FeOOH微粒表面外，不仅可提高α－FeOOH转变成γ－Fe2O3的热处理温度，有利于得到外形完好、晶格完整的γ－Fe2O3磁粉，而且由包效层与内核之间的界面相互作用引起的表面各向异性常…
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| 关 键 词： | 包敷 微粒 界面 氧化铁 |
| 收稿时间： | 1994-09-13 |
| 修稿时间： | 1995-04-10 |
Study on the Interface of SiO2/α-FeOOH and SiO2/γ-Fe2O3 Fine Particles |
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| Zhu Yihua, Li Chunzhong, Hu Liming.Study on the Interface of SiO2/α-FeOOH and SiO2/γ-Fe2O3 Fine Particles[J].Acta Physico-Chimica Sinica,1995,11(9):860-864. |
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| Authors: | Zhu Yihua Li Chunzhong Hu Liming |
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| Institution: | East China University of Science and Technology,Institute of Technical Chemical Physics,Shanghai 200237 |
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| Abstract: | The structures and chemical states of SiO2/α-FeOOH and SiO2/α-Fe2O3 fine particles have been investigated by the technologies of HREM, XPS and CELS. The results show that a crystalline interface layer between SiO2 coating and α-FeOOH nucleus is formed, and its chemical composition is infered to be α-Fe2O3. In view of this, a mechanism of its formation is presented. The results also show that the coating of SiO2/α-Fe2O3 obtained from SiO2/α-FeOOH by a thermal treatment is converted from an amorphous to crystal, line one and its mechanism is discussed. In addition, the effects of the coating on the structure of vacant state above Fermi level of α-FeOOH fine particles have also been studied. |
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| Keywords: | Coating Fine particle Interface Iron okide |
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