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Single- and Double-Layer Microwave Absorbers of Cobalt Ferrite and Graphite Composite at Gigahertz Frequency

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dc.citedby4
dc.contributor.authorIsmail I.en_US
dc.contributor.authorMatori K.A.en_US
dc.contributor.authorAbbas Z.en_US
dc.contributor.authorZulkimi M.M.M.en_US
dc.contributor.authorIdris F.M.en_US
dc.contributor.authorZaid M.H.M.en_US
dc.contributor.authorRahim N.en_US
dc.contributor.authorHasan I.H.en_US
dc.contributor.authorSong W.H.en_US
dc.contributor.authorid55123311400en_US
dc.contributor.authorid57217154525en_US
dc.contributor.authorid7005822035en_US
dc.contributor.authorid56255061100en_US
dc.contributor.authorid55602476400en_US
dc.contributor.authorid57195615326en_US
dc.contributor.authorid55358158400en_US
dc.contributor.authorid55932817100en_US
dc.contributor.authorid56287541700en_US
dc.date.accessioned2023-05-29T07:25:54Z
dc.date.available2023-05-29T07:25:54Z
dc.date.issued2019
dc.descriptionActivation energy; Arrhenius plots; Cobalt; Cobalt alloys; Cobalt compounds; Crystallography; Electromagnetic waves; Ferrite; Graphite; Hematite; Iron alloys; Particle size; Sintering; Cobalt ferrites; Double layer structure; Microwave absorbers; Reflection loss; Single layer; Mixer circuitsen_US
dc.description.abstractMicrowave absorbers of cobalt ferrite and graphite composite have been fabricated to investigate the broadening of absorption frequency by mixing small and large particles and comparing single- and double-layer composites in order to broaden the absorption frequency and to enhance multireflection and scattering of electromagnetic wave. CoO and Fe2O3 precursors were mechanically alloyed and sintered at 800, 900, 1000 and 1100 ?C in order to synthesise various particle sizes and shapes. A mixed sample of powders sintered at the above mentioned temperatures was also formed. The morphological, phase, and magnetic properties of these samples were studied. Two series of samples have been synthesised which were single- and double-layer composites. Single-layer composite consisted of mixed particles, and their thickness parameters were varied. Double-layer composite was also prepared with various particle sizes of CoFe2O4 as a layer and graphene as another layer. The effect of these layers as matching and absorbing layer was studied. The degree of crystallinity of CoFe2O4 was increased with increase of sintering temperature. Microstructural study showed the evolution of particle size and shape subjected to sintering temperature. Arrhenius plot showed two stages of growth process with activation energy calculated at 26.85 and 83.091 kJ/mol. The critical size of single domain of this sample plotted from the coercivity against particle size was 63.44 nm. Single-layer composite with mixed particle size was not able to show good electromagnetic (EM)-wave absorption; however double-layer composite showed good return loss. The mechanism of the EM-wave absorption of double-layer composite was discussed in this paper. � 2018, Springer Science+Business Media, LLC, part of Springer Nature.en_US
dc.description.natureFinalen_US
dc.identifier.doi10.1007/s10948-018-4749-x
dc.identifier.epage943
dc.identifier.issue4
dc.identifier.scopus2-s2.0-85049059197
dc.identifier.spage935
dc.identifier.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85049059197&doi=10.1007%2fs10948-018-4749-x&partnerID=40&md5=cbbeda529d23d177c9fe408a18bd7e6c
dc.identifier.urihttps://irepository.uniten.edu.my/handle/123456789/24690
dc.identifier.volume32
dc.publisherSpringer New York LLCen_US
dc.relation.ispartofAll Open Access, Green
dc.sourceScopus
dc.sourcetitleJournal of Superconductivity and Novel Magnetism
dc.titleSingle- and Double-Layer Microwave Absorbers of Cobalt Ferrite and Graphite Composite at Gigahertz Frequencyen_US
dc.typeArticleen_US
dspace.entity.typePublication
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