退火对Ni/TiO<sub>2</sub>纳米复合材料吸波性能的影响<sup>*</sup>

doi:10.11901/1005.3093.2013.847

材料研究学报

2014, Vol. 28

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

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退火对Ni/TiO₂纳米复合材料吸波性能的影响^*

孙乃坤(

),杜胜杰,杜宝盛,柳峰,赵美星

沈阳理工大学理学院沈阳 110159

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

引用本文:

孙乃坤,杜胜杰,杜宝盛,柳峰,赵美星. 退火对Ni/TiO₂纳米复合材料吸波性能的影响^*[J]. 材料研究学报, 2014, 28(4): 293-299.
Naikun SUN, Shengjie DU, Baosheng DU, Feng LIU, Meixing ZHAO. Influence of annealing treatment on Microstructure and Waves Absorption of Ni/TiO₂ Nanocomposites[J]. Chinese Journal of Materials Research, 2014, 28(4): 293-299.

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摘要:

采用机械化学法制备了Ni/TiO₂纳米复合材料, 制备态样品由六角形结构的金红石TiO₂和面心立方结构的Ni组成。退火使样品晶格缺陷和内应力减少, Ni晶粒尺寸和饱和磁化强度明显增大。退火后, TiO₂的本征发光峰、自由激子及束缚激子引起的发光峰都发生红移, 其原因是能带结构的畸变。制备态样品在15 GHz产生强烈的非线性介电共振, 并呈现明显的Cole-Cole半圆。当吸收厚度为8 mm时, 在14-16 GHz范围内的反射损耗值 (RL) 都超过了-10 dB, 且在15 GHz处出现最优RL值-32 dB。退火使制备态样品在2.8和5.2 GHz处的自然共振明显加强, 2-6 GHz范围的吸波能显著提高。

关键词 ：复合材料, 机械化学法, Ni/TiO₂纳米复合材料, 发光性能, 电磁性能, 退火

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

收稿日期: 2013-11-11

基金资助:* 辽宁省自然科学基金2013020105资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.847 或 https://www.cjmr.org/CN/Y2014/V28/I4/293

图1 样品A和B的XRD谱和SEM像

图2 样品A和B的室温磁滞回线和发射光谱

图3 样品A和B与石蜡复合样品的复介电常数和复磁导率

图4 样品A和B与石蜡复合样品的Cole-Cole半圆

图5 样品A和B与石蜡复合样品的介电损耗因子和磁损耗因子

图6 样品A和B与石蜡复合样品的的反射损耗

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