Single- and Double-Layer Microwave Absorbers of Cobalt Ferrite and Graphite Composite at Gigahertz Frequency
Activation 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 circuits
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2023
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my.uniten.dspace-246902023-05-29T15:25:54Z Single- and Double-Layer Microwave Absorbers of Cobalt Ferrite and Graphite Composite at Gigahertz Frequency Ismail I. Matori K.A. Abbas Z. Zulkimi M.M.M. Idris F.M. Zaid M.H.M. Rahim N. Hasan I.H. Song W.H. 55123311400 57217154525 7005822035 56255061100 55602476400 57195615326 55358158400 55932817100 56287541700 Activation 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 circuits Microwave 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. Final 2023-05-29T07:25:54Z 2023-05-29T07:25:54Z 2019 Article 10.1007/s10948-018-4749-x 2-s2.0-85049059197 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85049059197&doi=10.1007%2fs10948-018-4749-x&partnerID=40&md5=cbbeda529d23d177c9fe408a18bd7e6c https://irepository.uniten.edu.my/handle/123456789/24690 32 4 935 943 All Open Access, Green Springer New York LLC Scopus |
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Activation 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 circuits |
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55123311400 |
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55123311400 Ismail I. Matori K.A. Abbas Z. Zulkimi M.M.M. Idris F.M. Zaid M.H.M. Rahim N. Hasan I.H. Song W.H. |
| format |
Article |
| author |
Ismail I. Matori K.A. Abbas Z. Zulkimi M.M.M. Idris F.M. Zaid M.H.M. Rahim N. Hasan I.H. Song W.H. |
| spellingShingle |
Ismail I. Matori K.A. Abbas Z. Zulkimi M.M.M. Idris F.M. Zaid M.H.M. Rahim N. Hasan I.H. Song W.H. Single- and Double-Layer Microwave Absorbers of Cobalt Ferrite and Graphite Composite at Gigahertz Frequency |
| author_sort |
Ismail I. |
| title |
Single- and Double-Layer Microwave Absorbers of Cobalt Ferrite and Graphite Composite at Gigahertz Frequency |
| title_short |
Single- and Double-Layer Microwave Absorbers of Cobalt Ferrite and Graphite Composite at Gigahertz Frequency |
| title_full |
Single- and Double-Layer Microwave Absorbers of Cobalt Ferrite and Graphite Composite at Gigahertz Frequency |
| title_fullStr |
Single- and Double-Layer Microwave Absorbers of Cobalt Ferrite and Graphite Composite at Gigahertz Frequency |
| title_full_unstemmed |
Single- and Double-Layer Microwave Absorbers of Cobalt Ferrite and Graphite Composite at Gigahertz Frequency |
| title_sort |
single- and double-layer microwave absorbers of cobalt ferrite and graphite composite at gigahertz frequency |
| publisher |
Springer New York LLC |
| publishDate |
2023 |
| _version_ |
1806427785507373056 |
| score |
13.222552 |