Influence of annealing on the microwave-absorption properties of Ni/TiO2 nanocomposites

Influence of annealing on the microwave-absorption properties of Ni/TiO2 nanocomposites
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退火对Ni/TiO2纳米复合材料微波吸收性能的影响

DOI:
10.1016/j.jallcom.2013.06.172
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发表时间:
2013-11
影响因子:
6.2
通讯作者:
Shi, GuiMei
Shi, GuiMei
中科院分区:
材料科学2区
文献类型:
--
作者:
Sun, Naikun;Du, Baosheng;Liu, Feng;Si, Pingzhan;Zhao, Meixing;Zhang, Xueyuan;Shi, GuiMei

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退火使机械化学合成的Ni/ tio2纳米复合材料晶粒尺寸增大,并释放出较大的微应变。这大大增强了材料的介电谐振特性,并观察到一个清晰的Cole-Cole半圆,在12.6 GHz处反射损耗(RL)最大值为-45.2 dB,在整个ku波段的RL值超过- 10 dB,厚度为2.3 mm。特别是,在17.1 GHz的2.1 mm厚度下,在16.4至18 GHz的频率范围内发现了20 dB的带宽,RL值为41 dB。退火后微波吸收性能的显著改善可归因于介质共振的增强以及磁损耗和介质损耗的良好匹配。
Annealing enlarges the grain size and releases the large microstrain in the Ni/TiO2nanocomposite prepared by mechanochemical synthesis. This greatly enhances the dielectric resonance and a clear Cole–Cole semicircle is observed for the annealed sample, for which a maximum of reflection loss (RL) as large as –45.2 dB at 12.6 GHz with RL values exceeding −10 dB in the whole Ku-band is obtained for a layer of 2.3 mm thickness. In particular, a 20 dB bandwidth over the frequency range from 16.4 to 18 GHz with a RL value of 41 dB is found at 17.1 GHz for 2.1 mm thickness. The great improvement of microwave-absorption properties after annealing can be ascribed to an enhanced dielectric resonance and an excellent match of magnetic and dielectric loss.
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