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CLC number: TB333

On-line Access: 2018-05-04

Received: 2016-12-08

Revision Accepted: 2017-09-12

Crosschecked: 2018-03-23

Cited: 0

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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Xu-dong Cai

https://orcid.org/0000-0003-4492-6983

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Journal of Zhejiang University SCIENCE A 2018 Vol.19 No.5 P.409-416

http://doi.org/10.1631/jzus.A1600768


Effect of heat-treatment on LiZn ferrite hollow microspheres prepared by self-reactive quenching technology


Author(s):  Xu-dong Cai, Jian-jiang Wang, Xiao-jun Jiang, Jun Ling, Yi Xu, Zhan-tong Gao

Affiliation(s):  The First Scientific Research Institute of Wuxi, Wuxi 214035, China; more

Corresponding email(s):   caixudong87@qq.com

Key Words:  LiZn ferrites, Heat-treatment, Low frequency, Microwave absorption properties


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Xu-dong Cai, Jian-jiang Wang, Xiao-jun Jiang, Jun Ling, Yi Xu, Zhan-tong Gao. Effect of heat-treatment on LiZn ferrite hollow microspheres prepared by self-reactive quenching technology[J]. Journal of Zhejiang University Science A, 2018, 19(5): 409-416.

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journal="Journal of Zhejiang University Science A",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1600768"
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%T Effect of heat-treatment on LiZn ferrite hollow microspheres prepared by self-reactive quenching technology
%A Xu-dong Cai
%A Jian-jiang Wang
%A Xiao-jun Jiang
%A Jun Ling
%A Yi Xu
%A Zhan-tong Gao
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%DOI 10.1631/jzus.A1600768

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T1 - Effect of heat-treatment on LiZn ferrite hollow microspheres prepared by self-reactive quenching technology
A1 - Xu-dong Cai
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A1 - Yi Xu
A1 - Zhan-tong Gao
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Abstract: 
Lithium-zinc ferrite hollow microspheres (LiZn FHMs) containing special surface crystals were synthesized by self-reactive quenching technology. The samples were heat-treated at 1200 °C and held for 4 h. The influence of the heat-treatment on LiZn FHMs was studied. The results show that the surface of hollow microspheres is smooth without heat-treatment. The phase components are Fe2O3, Fe3O4, Li0.435Zn0.195Fe2.37O4, and Li0.5Fe2.5O4. The minimum reflectivity is −13.5 dB, and the corresponding frequency is 7.5 GHz. The effective absorption band lower than −10 dB is 6.2–8.5 GHz, and the bandwidth is 2.3 GHz. After heat-treatment, crystals on the surface of hollow microspheres grow significantly. Multiple-shape micro-nano crystals containing triangular, polygonal, and irregular crystal are generated. However, the phase composition does not change. The real part of the permittivity (e′), the imaginary part of permittivity (e″), the real part of permeability (µ′), and the imaginary part of permeability (µ″) all increase, and the microwave absorption properties at low frequency are significantly increased, with the absorption peak moving to a lower frequency range. The minimum reflectivity is −26.5 dB, and the corresponding frequency changes to 3.4 GHz. The effective absorption band is 2.6–4 GHz, and the bandwidth is 1.4 GHz.

This manuscript reports effect of Heat-treatment on LiZn ferrite hollow microspheres (LiZn FHMs) prepared by self-reactive quenching technology. The structure and morphology of LiZn FHMs are characterized. The results are interesting.

热处理对自反应淬熄法制备低频LiZn铁氧体空心微珠的影响

目的:自反应淬熄法制备的LiZn铁氧体空心微珠密度小,低频吸波性能良好,但微珠表面晶型生长不充分。对其采用特定热处理工艺不仅可以使晶体充分发育,获得特定晶型,还可以实现对低频吸波性能的有效调控。本文旨在研究热处理工艺对LiZn铁氧体空心微珠表面形貌、相结构和低频吸波性能的影响。
创新点:1. 通过热处理工艺,实现对LiZn铁氧体空心微珠表面形貌、相结构和低频吸波性能的有效调控;2. 深入分析热处理工艺对LiZn铁氧体空心微珠低频吸波性能的改善机理。
方法:1. 通过工艺探索,确定热处理的详细工艺参数。2. 通过扫描电子显微镜检测和X射线衍射分析,获得热处理前后LiZn铁氧体空心微珠的微观形 貌(图2)和物相组成(图3)。3. 通过矢量网络分析仪,获得热处理前后材料的电磁参数(图4);在此基础上对比其吸波性能(图5),并研究吸波影响机理。
结论:1. 采用240 °C/min升温至1200 °C并保温4 h的热处理后,LiZn铁氧体空心微珠表面晶粒明显长大;2. 热处理后,微珠四个电磁参数均有所增大,低频吸波性能明显提高,吸收峰值向低频移动;3. 表面多种形状微纳米晶粒的形成和长大可能是LiZn铁氧体空心微珠低频吸波性能得以提高的主要原因。

关键词:LiZn铁氧体;热处理;低频;吸波性能

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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