Full Text:   <2626>

Summary:  <1856>

CLC number: TB333

On-line Access: 2024-08-27

Received: 2023-10-17

Revision Accepted: 2024-05-08

Crosschecked: 2018-03-23

Cited: 0

Clicked: 3777

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Xu-dong Cai

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

-   Go to

Article info.
Open peer comments

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


Share this article to: More <<< Previous Article|

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.

@article{title="Effect of heat-treatment on LiZn ferrite hollow microspheres prepared by self-reactive quenching technology",
author="Xu-dong Cai, Jian-jiang Wang, Xiao-jun Jiang, Jun Ling, Yi Xu, Zhan-tong Gao",
journal="Journal of Zhejiang University Science A",
volume="19",
number="5",
pages="409-416",
year="2018",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1600768"
}

%0 Journal Article
%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
%J Journal of Zhejiang University SCIENCE A
%V 19
%N 5
%P 409-416
%@ 1673-565X
%D 2018
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1600768

TY - JOUR
T1 - Effect of heat-treatment on LiZn ferrite hollow microspheres prepared by self-reactive quenching technology
A1 - Xu-dong Cai
A1 - Jian-jiang Wang
A1 - Xiao-jun Jiang
A1 - Jun Ling
A1 - Yi Xu
A1 - Zhan-tong Gao
J0 - Journal of Zhejiang University Science A
VL - 19
IS - 5
SP - 409
EP - 416
%@ 1673-565X
Y1 - 2018
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1600768


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

Reference

[1]Cai XD, Wang JJ, Xu BC, et al., 2013. Effect of heat-treatment temperature on structure and microwave electromagnetic properties of hollow multiphase ceramic microspheres. Journal of the Chinese Ceramic Society, 41:1331-1338 (in Chinese).

[2]Cai XD, Wang JJ, Liang GH, et al., 2015a. Effect of NaNO3 foaming agent on barium ferrite hollow microspheres prepared by self-reactive quenching technology. Journal of Alloys and Compounds, 636:348-356.

[3]Cai XD, Wang JJ, Yang RX, et al., 2015b. Influence of the foaming agent on the particle size and microwave absorption properties of hollow ceramic microspheres. International Journal of Applied Ceramic Technology, 12: E8-E16.

[4]Cai XD, Wang JJ, Xu BC, et al., 2015c. Preparation of LiZn ferrites hollow microspheres based self-reactive quenching technology and study on their low-frequency microwave absorption properties. Rare Metal Materials and Engineering, 391:2335-2339.

[5]Feng YB, Tang CM, Qiu T, 2013. Effect of ball milling and moderate surface oxidization on the microwave absorption properties of FeSiAl composites. Materials Science and Engineering: B, 178(16):1005-1011.

[6]Gruskova A, Slama J, Dosoudil R, 2008. Microwave properties of some substituted LiZn ferrites. Journal of Magnetism and Magnetic Materials, 320(20):e860-e864.

[7]Hu GX, Cai X, Rong YH, 2010. Fundamentals of Materials Science. Shanghai Jiao Tong University Press, Shanghai, China, p.20-22 (in Chinese).

[8]Jiang H, Guo Z, Zhao L, et al., 2010. Preparation and microwave absorption properties of LiZn ferrite. Journal of Inorganic Materials, 25(1):73-76.

[9]Lan YH, Gao XX, Bao XQ, 2007. Study of barium ferrite based on self-propagating high-temperature synthesis. Materials Review, 21:333-335.

[10]Liu CY, Lan ZW, Jiang XN, et al., 2008. Effects of sintering temperature on the microstructure and magnetic properties of LiZn ferrites. Journal of Magnetism and Magnetic Materials, 39:36-38.

[11]Liu SH, Guo HJ, 2002. Electromagnetic shielding and wave-absorbing materials. Journal of Functional Materials and Devices, 8:213-216.

[12]Liu SH, Liu JM, Dong XL, 2007. Electromagnetic Wave Shielding and Absorbent. Chemical Industrial Press, Beijing, China, p.67-70 (in Chinese).

[13]Lou HF, 2014. Designing, Synthesis and Study on High-frequency Absorbing Performance of Ferrite Hollow Microspheres by Self-reactive Quenching Technology. MS Thesis, Mechanical Engineering College, Shijiazhuang, China (in Chinese).

[14]Qu LY, 2009. Preparation and properties of low frequency band absorbing material. Modern Defense Technology, 37:131-133.

[15]Si Q, Dong FQ, 2006. Study on electromagnetic shielding effectiveness in low frequency of coatings doping aggregate and iron carbonyl. Functional Materials, 37: 883-892.

[16]Sun C, 2007. Synthesis and Microwave Absorbing Properties of Low Frequency Absorber. MS Thesis, Shandong University, Jinan, China (in Chinese).

[17]Sun C, Sun KN, 2007. Preparation and characterization of magnesium-substituted LiZn ferrites by a sol-gel method. Physical Review B, 391:335-338.

[18]Tong SY, Wu JM, Tung MJ, et al., 2012. Effect of Ni concentration on electromagnetic wave absorption of (Ni, Mn, Zn)Fe2O4/resin particulate composites. Journal of Alloys and Compounds, 525:143-148.

[19]Xia DG, Lu BS, Wang HK, 2010. Preparation Principle and Technology of Soft Magnetic Ferrites. Shaanxi Press, Xi’an, China, p.325-327 (in Chinese).

[20]Xie GZ, Yuan LK, Wang P, et al., 2010. GHz microwave properties of melt spun Fe-Si alloys. Journal of Non-crystalline Solids, 356(2):83-86.

[21]Yang M, 2010. Technology Handbook of Heat-treatment. China Machine Press, Beijing, China, p.124-126 (in Chinese).

[22]Yin C, Stark B, Chen YQ, et al., 2013. Adaptive minimum energy cognitive lighting control: integer order vs fractional order strategies in sliding mode based extremum seeking. Mechatronics, 23(7):863-872.

[23]Yu J, Chen SJ, Chen X, et al., 2015. Experimental investigation on mechanical properties and permeability evolution of red sandstone after heat treatments. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 16(9):749-759.

[24]Yu Z, Chen DZ, Lan ZW, et al., 2007. Effect of Bi2O3 on properties of LiZn ferrites. Journal of Inorganic Materials, 22:1173-1177.

[25]Zan MSD, Kato I, Ab-Rahman MS, et al., 2009. Characterization of a-Si:H/SiN multilayer waveguide polarization using an optical pumping application-LED. Journal of Zhejiang University-SCIENCE A, 10(10):1421-1427.

[26]Zhang KC, Zhang LH, 1981. Crystal Growth. Science Press, Beijing, China, p.232-233 (in Chinese).

[27]Zhang ZQ, Li TH, Jing DQ, 2007. Present status and perspectives of the radar absorbing material. Materials Review, 21:307-310.

Open peer comments: Debate/Discuss/Question/Opinion

<1>

Please provide your name, email address and a comment





Journal of Zhejiang University-SCIENCE, 38 Zheda Road, Hangzhou 310027, China
Tel: +86-571-87952783; E-mail: cjzhang@zju.edu.cn
Copyright © 2000 - 2024 Journal of Zhejiang University-SCIENCE