Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jpcs.2013.09.021
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dc.titleModel design on calculations of microwave permeability and permittivity of Fe/SiO2 particles with core/shell structure
dc.contributor.authorYang, Y.
dc.contributor.authorLi, Z.W.
dc.contributor.authorNeo, C.P.
dc.contributor.authorDing, J.
dc.date.accessioned2014-10-07T09:52:03Z
dc.date.available2014-10-07T09:52:03Z
dc.date.issued2014-02
dc.identifier.citationYang, Y., Li, Z.W., Neo, C.P., Ding, J. (2014-02). Model design on calculations of microwave permeability and permittivity of Fe/SiO2 particles with core/shell structure. Journal of Physics and Chemistry of Solids 75 (2) : 230-235. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jpcs.2013.09.021
dc.identifier.issn00223697
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/86552
dc.description.abstractFe/SiO2 particles with core/shell structure were prepared by coating silica on the surface of a commercial spherical carbonyl iron via the hydrolysis process of tetraethyl orthosilicate (TEOS). The electromagnetic performance of commercial carbonyl iron and as-prepared Fe/SiO2 particles was studied theoretically and experimentally. As predicted by the theoretical calculation based on the Bruggeman formula and the Landau-Lifshitz-Gilbert (LLG) theory, the insulating surface layer of silica was effective to reduce the permittivity parameters of pure carbonyl iron. The measured results showed good agreement with the theoretical prediction. Although there was a little decrease in the permeability of the Fe/SiO2 core/shell particles, a better impedance match especially at higher frequency range was obtained when used as a microwave absorber. The reflection loss (RL) curves show that the lowest reflection loss of Fe/Epoxy composite (-20.5 GHz) was obtained corresponding to the frequency of 8.5 GHz when the thickness of the absorber was 3 mm. A different trend was observed in Fe/SiO2/Epoxy composite. The reflection loss value got lower by decreasing the thickness of absorbers. At the thickness of 2.2 mm, a relative low reflection loss (-17 GHz) corresponding to the frequency of 13.6 GHz was obtained. Compared with the Fe/Epoxy composite, the improvement on shifting the reflection loss peak to higher frequency and on reducing the optimal thickness of absorbers was made by Fe/SiO2/Epoxy composite. © 2013 Elsevier Ltd.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.jpcs.2013.09.021
dc.sourceScopus
dc.subjectA.Magnetic materials
dc.subjectA.Nanostructures
dc.subjectB.Chemical synthesis
dc.subjectC.Electron microscopy
dc.subjectD.Dielectric properties
dc.typeArticle
dc.contributor.departmentMATERIALS SCIENCE AND ENGINEERING
dc.description.doi10.1016/j.jpcs.2013.09.021
dc.description.sourcetitleJournal of Physics and Chemistry of Solids
dc.description.volume75
dc.description.issue2
dc.description.page230-235
dc.description.codenJPCSA
dc.identifier.isiut000329270800011
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