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)‡
aDivision of Functional Material Research, Central Iron & Steel Research Institute, Beijing 100081, China; bCollege of Chemical and Environmental Engineering, Beijing Technology and Business University, Beijing 100048, China
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.
Received: 05 March 2009
Revised: 24 March 2009
Accepted manuscript online:
PACS:
75.60.Ej
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: Project supported by
the National Natural Science Foundation of
China (Grant No 50671026).
Cite this article:
Tang Bao-Lin(唐葆霖), He Jun(何峻), Ji Tian-Hao(嵇天浩), and Wang Xin-Lin(王新林) Microstructural and electromagnetic properties of MnO2 coated nickel particles with submicron size 2009 Chin. Phys. B 18 2571
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