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首页> 外文期刊>RSC Advances >Well protected SmCo nanoclusters: fabrication and transformation to single crystals
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Well protected SmCo nanoclusters: fabrication and transformation to single crystals

机译：受保护的SMCO纳米团簇：制造和转化为单晶

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摘要

Highly pure SmCo nanoclusters (NCs) were prepared by a cluster beam deposition (CBD) method. A very thin (<5 nm) protective layer of carbon (C) was used to protect the nanoclusters from oxidation. No oxygen traces were found even after six months, demonstrating that the pure SmCo NCs can be well protected by a thin C protection layer. This result is of significance for the application of high anisotropy rare earth magnetic nanoparticles. Small size NCs experience diffusion-arbitrated coalescence after deposition causing nonuniform size distribution whereas larger clusters show uniform size distribution. Post-annealing SmCo NCs at 500 degrees C transforms the structure into the single crystal SmCo5 phase with hexagonal CaCu5 symmetry. Higher temperature (>= 600 degrees C) post-annealing causes the structural deterioration of the NCs due to reaction between C and SmCo NCs which is a nanoscale effect and was not observed in bulk counterparts even at 900 degrees C. The single crystal SmCo5 NCs have potential applications in high density recording media and permanent magnetic materials. In addition, Sm(Co0.7Ni0.3)(5) NCs were also prepared. As-produced Sm(Co0.7Ni0.3)(5) NCs were amorphous and crystallized at 500 degrees C. The coercivity of the crystallized Sm(Co0.7Ni0.3)(5) NCs was observed as 1820 Oe. These crystallized NCs might be important for scientific as well as future applications.
机译：通过簇束沉积（CBD）方法制备高度纯度的SMCO纳米能器（NCS）。使用非常薄的（<5nm）的碳（c）保护层来保护纳米能器免受氧化。即使在六个月后，也没有发现氧气痕迹，证明纯SMCO NC可以通过薄C保护层良好保护。该结果对高各向异性稀土磁性纳米粒子的应用具有重要性。在沉积后，小尺寸NCS经验序列仲裁结合，导致非均匀尺寸分布，而较大的簇显示出均匀的尺寸分布。 500摄氏度下的退火SMCO NCS将结构与六边形CACU5对称性转化为单晶SMCO5相。由于纳米级效应的C和SMCO NCs之间的反应，较高的温度（> = 600摄氏度）导致NCS的结构劣化导致NCS的反应，即使在900摄氏度下也未观察到散装对应物的反应。单晶SMCO5 NCS具有高密度记录介质和永磁材料的潜在应用。此外，还制备SM（COO.7NI0.3）（5）NCS。如此生产的SM（Co0.7Ni0.3）（5）NC的是非晶态，并在500摄氏度的结晶SM（Co0.7Ni0.3）的矫顽力结晶，观察到在1820年奥斯特（5）的NC。这些结晶的NCS对于科学以及未来的应用可能是重要的。

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  • 来源
    《RSC Advances》 |2017年第81期|共7页
  • 作者

    Abbas Nadeem; Ding Jian-zhong; Liu J. Ping; Du Juan; Xia Wei-xing; Yan A-ru; Wang Fang; Zhang Jian;

  • 作者单位

    Chinese Acad Sci Ningbo Inst Mat Technol &

    Engn CAS Key Lab Magnet Mat &

    Devices Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol &

    Engn CAS Key Lab Magnet Mat &

    Devices Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol &

    Engn CAS Key Lab Magnet Mat &

    Devices Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol &

    Engn CAS Key Lab Magnet Mat &

    Devices Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol &

    Engn CAS Key Lab Magnet Mat &

    Devices Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol &

    Engn CAS Key Lab Magnet Mat &

    Devices Ningbo 315201 Zhejiang Peoples R China;

    Ningbo Univ Technol Ningbo 315211 Zhejiang Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol &

    Engn CAS Key Lab Magnet Mat &

    Devices Ningbo 315201 Zhejiang Peoples R China;

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