Enhanced electromagnetic wave absorption properties of planar anisotropy carbonyl-iron/Fe3O4 composites in gigahertz range. (May 2014)

• Record Type: Journal Article
• Authors: Zou, J.; Liu, Q.; Zi, Z.; Dai, J.
• Is Part Of: Materials research innovations. Volume 18:Number 2(2014)
• Page Start: 304
• Page End: 309
• Publication Date: 2014-05
• Subjects: Materials -- Research -- Periodicals; Matériaux -- Recherche -- Périodiques; 620.1105
• DOI: 10.1179/1432891714Z.000000000422
• Languages: English
• ISSNs: 1432-8917

Abstract

<abstract> <title> <x content-type="archive" xml:space="preserve">Abstract</x> </title> <p>The planar anisotropy ball milling carbonyl-iron/Fe₃O₄ composites (BMCI/Fe₃O₄) have been synthesised via ball milling technique and hydrothermal method. The constituents, phase, and morphology have been characterised by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electromagnetic wave absorption properties are measured by vector network analysis (VNA). The results indicate that BMCI/Fe₃O₄ composites synthesised in the pH values of 12 and 13 have absorption peak values of about −33·5 dB at 3·9 GHz and −28·2 dB at 4·2 GHz respectively, when the volume fraction of BMCI/Fe₃O₄ composites is only 20% and the matching thickness is 3·0 mm. A layer of ferromagnetic Fe₃O₄ crystals on the surface of BMCI has an obvious effect on the electromagnetic wave absorption properties of composites. A possible mechanism of the improved electromagnetic wave absorption properties of the composite has also been discussed.</p> </abstract>