4.6 Article

Synthesis and microwave absorbing properties of Ni-Cu ferrite/MWCNTs composites

Journal

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume 26, Issue 10, Pages 7698-7704

Publisher

SPRINGER
DOI: 10.1007/s10854-015-3411-7

Keywords

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Funding

  1. Chinese National Natural Science Foundation of China [51072165]
  2. State Key Laboratory of Solidification Processing in Northwestern Polytechnical University [KP201307]

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The electromagnetic and microwave absorbing properties of the nickel-copper (Ni-Cu) nanoferrites and multi-walled carbon nanotubes (MWCNTs) filled into epoxy resin were investigated in the X band (8.2-12.4 GHz), and the Ni-Cu nanoferrites were synthesized using auto-combustion method. The Ni-Cu ferrite annealing temperature was chosen at 600 A degrees C to obtain the good magnetic properties. When the MWCNTs were added, the values of complex permittivity were enhanced by improving the interfacial polarization. The magnetic properties may be attributed to increase the concentration of Fe3+ ions in octahedral sites, which in turn induces the magnetization of the Ni-Cu ferrite. By changing the MWCNTs content, the optimizing reflection loss bandwidth below -10 dB can reach 3.2 GHz with the absorber thickness of 2.3 mm.

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