中国物理B ›› 2009, Vol. 18 ›› Issue (6): 2571-2575.doi: 10.1088/1674-1056/18/6/075

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Microstructural and electromagnetic properties of MnO2 coated nickel particles with submicron size

嵇天浩1, 唐葆霖2, 何峻2, 王新林2   

  1. (1)College of Chemical and Environmental Engineering, Beijing Technology and Business University, Beijing 100048, China; (2)Division of Functional Material Research, Central Iron {$ &$ Steel Research Institute, Beijing 100081, China
  • 收稿日期:2009-03-05 修回日期:2009-03-24 出版日期:2009-06-20 发布日期:2009-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 50671026).

Microstructural and electromagnetic properties of MnO2 coated nickel particles with submicron size

Tang Bao-Lin(唐葆霖)a), He Jun(何峻)a)†, Ji Tian-Hao(嵇天浩)b), and Wang Xin-Lin(王新林)a)‡   

  1. a Division of Functional Material Research, Central Iron & Steel Research Institute, Beijing 100081, China; b College of Chemical and Environmental Engineering, Beijing Technology and Business University, Beijing 100048, China
  • Received:2009-03-05 Revised:2009-03-24 Online:2009-06-20 Published:2009-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 50671026).

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摘要： Nickel particles with submicron size are prepared by using the solvothermal method. These spheres are then coated with a layer of MnO2 using the soft chemical method. The microstructure is characterized by x-ray diffraction, transmission electron microscopy, and scanning electron microscopy. Energy x-ray dispersive spectrometry and high-resolution images show that the granular composites have a classical core/shell structure with an MnO2 superficial layer, no more than 10~nm in thickness. The hysteresis measurements indicate that these submicron-size Ni composite powders have small remanence and moderate coercivity. The electromagnetic properties of the powders measured by a vector network analyzer in a frequency range of 2--18~GHz are also reported in detail.

关键词: core/shell, microstructure, submicron, electromagnetic properties

Abstract: Nickel particles with submicron size are prepared by using the solvothermal method. These spheres are then coated with a layer of MnO2 using the soft chemical method. The microstructure is characterized by x-ray diffraction, transmission electron microscopy, and scanning electron microscopy. Energy x-ray dispersive spectrometry and high-resolution images show that the granular composites have a classical core/shell structure with an MnO2 superficial layer, no more than 10~nm in thickness. The hysteresis measurements indicate that these submicron-size Ni composite powders have small remanence and moderate coercivity. The electromagnetic properties of the powders measured by a vector network analyzer in a frequency range of 2--18~GHz are also reported in detail.

Key words: core/shell, microstructure, submicron, electromagnetic properties

中图分类号:  (Magnetization curves, hysteresis, Barkhausen and related effects)

  • 75.60.Ej
61.05.cp (X-ray diffraction) 68.37.Hk (Scanning electron microscopy (SEM) (including EBIC)) 68.37.Lp (Transmission electron microscopy (TEM)) 75.50.Tt (Fine-particle systems; nanocrystalline materials)