Influence of annealing treatment on Microstructure and Waves Absorption of Ni/TiO2 Nanocomposites

doi:10.11901/1005.3093.2013.847

Chinese Journal of Materials Research

2014, Vol. 28

Issue (4): 293-299 DOI: 10.11901/1005.3093.2013.847

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Influence of annealing treatment on Microstructure and Waves Absorption of Ni/TiO₂ Nanocomposites

Naikun SUN(

),Shengjie DU,Baosheng DU,Feng LIU,Meixing ZHAO

School of Science, Shenyang Ligong University, Shenyang 110159

Cite this article:

Naikun SUN,Shengjie DU,Baosheng DU,Feng LIU,Meixing ZHAO. Influence of annealing treatment on Microstructure and Waves Absorption of Ni/TiO₂ Nanocomposites. Chinese Journal of Materials Research, 2014, 28(4): 293-299.

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Abstract

Ni/TiO₂ nanocomposite was prepared by mechano-chemical synthesis. The as-milled nanocomposite consists of hexagonal-structure rutile TiO₂ and face-centered cubic structure Ni. Annealing treatment decreases both the lattice defects and the internal stress, while remarkably increases the grain size of metal Ni and the saturation magnetization. After annealing treatment the intrinsic emission, free exciton emission and bound exciton emission peaks of TiO₂ exhibit a red shift, for which the reason may be the distortion of the band structure. For the as-milled nanocomposite an intense nonlinear dielectric resonance occurs at 15 GHz and a clear Cole-Cole semicircle was observed. Meanwhile, a reflection loss (RL) exceeding -10 dB in a frequency range of 14-16 GHz and a maximum value of RL as large as -32 dB are obtained for an 8 mm thick absorber. After annealing treatment the intensity of the natural resonances at 2.8 and 5.2 GHz has been significantly strengthened, leading to a remarkable improvement of microwave-absorption properties in the frequency range 2-6 GHz.

Key words: composites mechanochemical synthesis Ni/TiO₂ nanocomposites luminescence properties electromagnetic properties annealing

Received: 11 November 2013

Fund: *Supported by Liaoning Provincial Natural Science Foundation of China No. 2013020105.

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	Naikun SUN
	Shengjie DU
	Baosheng DU
	Feng LIU
	Meixing ZHAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.847 OR https://www.cjmr.org/EN/Y2014/V28/I4/293

Fig.1 XRD patterns (a, b) and SEM images (c, d) of samples A and B

Fig.2 Hysteresis loop (a) and emission spectra (b) of samples A and B

Fig.3 Relative complex permittivity (a) and relative complex permeability (b) of samples A and B dispersed in paraffin

Fig.4 Typical Cole-Cole semicircles for samples A (a) and B (b) dispersed in paraffin

Fig.5 Dielectric loss (a) and magnetic loss factors (b) of samples A and B dispersed in paraffin

Fig.6 Frequency dependence of the RL of the nanocomposites dispersed in paraffin for sample A (a) and for sample B (b)

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