Preparation of Lightweight Nanocrystalline and Mesoporous Barium Ferrite
- Paper number
IAC-06-C2.8.06
- Author
Mrs. Huang Ying, Northwestern Polytechnical University, China
- Coauthor
Mr. Huang Fei, Northwestern Polytechnical University, China
- Coauthor
Mrs. Qi Shuhua, Northwestern Polytechnical University, China
- Year
2006
- Abstract
The useless or deleteroius electromagnetism energy generated by electromagnetism pollution can be absorbed and transferred by the microwave absorbing material.The microwave absorbing technology as an anti-electromagnetic interference measure is widely used in the field of aeronautics and astronautics.The density of conventional barium ferrite is high,so that is difficult to satisfy the requirement of modern communications and electronic warfare technology.We adopt template synthesis to obtain nanocrystalline and mesoporous barium ferrite and we do succeed reducing the density of barium ferrite by approxomately 49%. In the paper,we prepared barium ferrite by sol-gel technology,adding the sol in organic amine.We characterized the samples with TG(thermogravimetry),DSC (differential scanning calorimetry),XRD(X-ray diffraction) and FT-IR(Fourier transform infrared) techniques.Results show that the n-butylaine’s templet action is better than those of triethylamine and triethanolamine.The reason maybe that the n-butylaine and the gel can form proper space structure,further more the n-butylaine can disengage from crystals easily to finish nucleation,grouwth and phase transformation.Consequently we can obtain nanocrystalline and mesoporous barium ferrite.Employing N2 absorption-desorption isotherms,we obtained the following results:(1)mesopores that were nearly uniform in diameter,the average diameter being 9.42nm;(2)with an addition of 40wt% of n-butylaine,the specific pore volume was 0.026cm3/g,and density was 2.73g/cm3(the standard density of barium ferrite is 5.32g/cm3).Again,under an addition of 40wt% of n-butylaine,we,employing AJ-III AFM(atom force microcopy),found that the crystalline structue of barium ferrite was good,the average particle size was 119.550nm,and the minimum particle size was 22.039nm.
- Abstract document
- Manuscript document
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