Abstract
Ni/Al2O3 nanocomposites were prepared by the mechanochemical synthesis method. The annealing process enlarges the grain size of both the metal Ni and insulating Al2O3 in the as-milled nanocomposite and leads to an increase of the saturation magnetization and a decrease of the surface anisotropy. An optimal reflection loss (RL) of −23 dB is obtained in the as-milled nanocomposite at 17.8 GHz for an absorber thickness of 6.6 mm. The annealed sample exhibits a RL exceeding −20 dB in the whole K u-band for an absorber thickness of 6.6–9.7 mm with an optimal RL of −54.7 dB at 13.2 GHz for a layer thickness of 9.3 mm. The excellent microwave-absorption properties are a consequence of a proper match of the dielectric and magnetic losses.
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Xu, S., Zhao, M., Cai, Z. et al. Effect of annealing on the microwave-absorption properties of Ni/Al2O3 nanocomposites. ACTA METALL SIN 26, 385–389 (2013). https://doi.org/10.1007/s40195-013-0001-7
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DOI: https://doi.org/10.1007/s40195-013-0001-7