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Effects of ordered mesoporous structure and La-doping on the microwave absorbing properties of CoFe2O4
Shang, T; Lu, QS; Chao, LM; Qin, YL; Yun, YH; Yun, GH; Yun, GH (reprint author), Inner Mongolia Univ, Sch Phys Sci & Technol, Inner Mongolia Key Lab Nanosci & Nanotechnol, Hohhot 010021, Peoples R China.
2018-03-15
Source PublicationAPPLIED SURFACE SCIENCE
ISSN0169-4332
Volume434Pages:234-242
AbstractLow-density ordered mesoporous CoFe2O4 (O-CFO) and CoLa0.12Fe1.88O4 (O-CLFO) are prepared by nanocasting method using mesoporous silica SBA-15 as a hard-template. The crystal structure, surface chemical state, magnetic properties and electromagnetic parameters are characterized by X-ray diffraction, transmission electron microscopy, N-2 adsorption-desorption measurement, X-ray photoelectron spectroscopy, physical property measurement system and vector network analyzer. The results show that all the samples formed a single phase with cubic spinel structure. Meanwhile O-CFO and O-CLFO possess a highly ordered mesostructure. Comparing with particle CoFe2O4 (P-CFO), O-CFO with high specific surface area exhibits lower magnetic saturation (M-s), higher imaginary part of complex permittivity (epsilon '') and imaginary part of the complex permeability (mu ''). The minimum reflection loss (RL) of O-CFO reaches -27.36 dB with a matching thickness of 3.0 mm. The enhancement of the microwave absorbing performances of O-CFO can be mainly attributed to the good impedance matching, high electromagnetic wave attenuation and multiple reflections of electromagnetic wave originated from the ordered mesoporous structure. The M-s of O-CLFO decreases after La3+ doping, while the specific surface area, coercivity value, epsilon '' and mu '' of O-CLFO increase. The minimum R-L of O-CLFO reaches -46.47 dB with a thickness of 3.0 mm, and the effective absorption frequency bandwidth reaches 4.9 GHz. (C) 2017 Published by Elsevier B.V.; Low-density ordered mesoporous CoFe2O4 (O-CFO) and CoLa0.12Fe1.88O4 (O-CLFO) are prepared by nanocasting method using mesoporous silica SBA-15 as a hard-template. The crystal structure, surface chemical state, magnetic properties and electromagnetic parameters are characterized by X-ray diffraction, transmission electron microscopy, N-2 adsorption-desorption measurement, X-ray photoelectron spectroscopy, physical property measurement system and vector network analyzer. The results show that all the samples formed a single phase with cubic spinel structure. Meanwhile O-CFO and O-CLFO possess a highly ordered mesostructure. Comparing with particle CoFe2O4 (P-CFO), O-CFO with high specific surface area exhibits lower magnetic saturation (M-s), higher imaginary part of complex permittivity (epsilon '') and imaginary part of the complex permeability (mu ''). The minimum reflection loss (RL) of O-CFO reaches -27.36 dB with a matching thickness of 3.0 mm. The enhancement of the microwave absorbing performances of O-CFO can be mainly attributed to the good impedance matching, high electromagnetic wave attenuation and multiple reflections of electromagnetic wave originated from the ordered mesoporous structure. The M-s of O-CLFO decreases after La3+ doping, while the specific surface area, coercivity value, epsilon '' and mu '' of O-CLFO increase. The minimum R-L of O-CLFO reaches -46.47 dB with a thickness of 3.0 mm, and the effective absorption frequency bandwidth reaches 4.9 GHz. (C) 2017 Published by Elsevier B.V.
description.department[shang, tao ; lu, qingshan ; qin, yanli ; yun, yuehou ; yun, guohong] inner mongolia univ, sch phys sci & technol, inner mongolia key lab nanosci & nanotechnol, hohhot 010021, peoples r china ; [yun, guohong] inner mongolia normal univ, coll phys & elect informat, hohhot 010022, peoples r china ; [chao, luomeng] chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, liaoning, peoples r china
KeywordElectromagnetic Absorption Properties Magnetic-properties Saturation Magnetization Ferrite Nanoparticles Oxide Graphene Nanostructures Microspheres Composites Oxidation
Subject AreaChemistry, Physical ; Materials Science, Coatings & Films ; Physics, Applied ; Physics, Condensed Matter
Funding OrganizationNational Natural Science Foundation of China [11072104, 51202103]; National Natural Science Foundation of The Inner Mongolia Autonomous Region [2015MS0524]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79432
Collection中国科学院金属研究所
Corresponding AuthorYun, GH (reprint author), Inner Mongolia Univ, Sch Phys Sci & Technol, Inner Mongolia Key Lab Nanosci & Nanotechnol, Hohhot 010021, Peoples R China.
Recommended Citation
GB/T 7714
Shang, T,Lu, QS,Chao, LM,et al. Effects of ordered mesoporous structure and La-doping on the microwave absorbing properties of CoFe2O4[J]. APPLIED SURFACE SCIENCE,2018,434:234-242.
APA Shang, T.,Lu, QS.,Chao, LM.,Qin, YL.,Yun, YH.,...&Yun, GH .(2018).Effects of ordered mesoporous structure and La-doping on the microwave absorbing properties of CoFe2O4.APPLIED SURFACE SCIENCE,434,234-242.
MLA Shang, T,et al."Effects of ordered mesoporous structure and La-doping on the microwave absorbing properties of CoFe2O4".APPLIED SURFACE SCIENCE 434(2018):234-242.
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