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Ferromagnetic and excellent microwave absorbing properties of CoNi microspheres and heterogeneous Co/Ni nanocrystallines

机译：CoNi微球和异质Co / Ni纳米晶体的铁磁和优异的微波吸收性能

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摘要

CoNi microspheres with different diameters and heterogeneous Co/Ni nanocrystallines were synthesized via changing hydrothermal reaction parameters. The heterogeneous Co/Ni nanocrystallines comprised three kinds of particle morphologies, i.e. , nanoflakes, nanospheres and needle-like nanowhiskers. The heterogeneous Co/Ni nanocrystalline sample coating (containing 60 wt% powder) exhibited a maximum reflection loss (RL) of ?33 dB at 17.6 GHz and a bandwidth of less than ?10 dB covering the 15.04–18.00 GHz range with a coating thickness of 1 mm. The CoNi microsphere sample with diameters in the range of 0.4–2.5 μm exhibited excellent microwave absorption abilities in the C-band (4–8 GHz) and X-band (8–11.5 GHz). However, the sample of chain-like assemblies from CoNi microspheres with a diameter above 2 μm presented poor microwave absorption in the 2–18 GHz range. In contrast, the excellent microwave absorption properties of the heterogeneous Co/Ni nanocrystalline sample in the Ku-band (12–18 GHz) could be attributed to the relatively high permeability (1.63–1.10) and optimal impedance matching between permittivity and permeability.
机译：通过改变水热反应参数，合成了直径不同的CoNi微球和Co / Ni纳米晶。 Co / Ni纳米异质晶体包含三种颗粒形态，即纳米薄片，纳米球和针状纳米晶须。 Co / Ni纳米晶样品涂层（含60％（重量）粉末）在17.6 GHz时表现出最大反射损耗（RL）为？33 dB，在涂层厚度为15.04-18.00 GHz的范围内，带宽小于？10 dB 1毫米直径在0.4–2.5μm范围内的CoNi微球样品在C波段（4–8 GHz）和X波段（8–11.5 GHz）中表现出出色的微波吸收能力。但是，直径大于2μm的CoNi微球状链状组件的样品在2–18 GHz范围内的微波吸收能力很差。相比之下，Ku波段（12–18 GHz）中异质Co / Ni纳米晶样品的优异微波吸收特性可归因于相对较高的磁导率（1.63–1.10）和介电常数与磁导率之间的最佳阻抗匹配。

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