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首页> 外文期刊>Journal of Applied Physics >Variation Of Structural And Magnetic Properties With Co-doping In Zn_(1-x)co_xo Nanocrystals
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Variation Of Structural And Magnetic Properties With Co-doping In Zn_(1-x)co_xo Nanocrystals

机译：Zn_（1-x）co_xo纳米晶体中共掺杂的结构和磁性的变化

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摘要

The Zn_(1-x)Co_xO (x=0-0.20) nanocrystals synthesized via sol-gel method have been systematically investigated by using x-ray diffraction, transmission electronic microscopy (TEM), Raman spectrometer (Raman), UV-vis spectrometer (UV-vis), and vibrating sample magnetometer. It is found that the crystal lattice constant (a) and the cell volume of Zn_(1-x)Co_xO are irrespective of the Co composition x when x<0.05, while it expands gradually as x increasing from 0.05 to 0.2. This result is different from the existent reports, which indicated the lattice constant (a) and the cell volume both increase consecutively with Co-doping. Detailed Raman, UV-vis, and TEM study suggest the expansion of lattice constant when x > 0.05 is attributed to the formation of the Co_3O_4 phase in Zn_(1-x)Co_xO due to the self-purification mechanism in nanocrystals growth process. The formation of the antiferromagnetic Co_3O_4 well explains the decrease in Zn_(1-x)Co_xO ferromagnetism with the increase in Co-doping when x > 0.05.
机译：利用X射线衍射，透射电子显微镜（TEM），拉曼光谱仪（Raman），紫外可见光谱仪系统研究了溶胶-凝胶法合成的Zn_（1-x）Co_xO（x = 0-0.20）纳米晶体。 （UV-vis）和振动样品磁力计。发现当x ＜0.05时，晶格常数（a）和Zn_（1-x）Co_xO的晶胞体积与Co组成x无关，而随着x从0.05增加到0.2逐渐增大。该结果与现有报道不同，后者表明晶格常数（a）和晶胞体积均随Co掺杂而连续增加。详细的拉曼光谱，紫外可见光谱和TEM研究表明，当x> 0.05时，晶格常数的扩展归因于Zn_（1-x）Co_xO中Co_3O_4相的形成，这归因于纳米晶体生长过程中的自纯化机制。当x> 0.05时，随着Co掺杂的增加，反铁磁Co_3O_4阱的形成解释了Zn_（1-x）Co_xO铁磁性的降低。

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  • 来源
    《Journal of Applied Physics》 |2009年第5期|378-382|共5页
  • 作者

    Jian-jun Li; Wei-chang Hao; Huai-zhe Xu; Tian-min Wang;

  • 作者单位

    Center of Materials Physics and Chemistry, Beihang University, Beijing 100083, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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