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Journal of Materials Chemistry C Vol - 2 Issue - 19

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Journal of Materials Chemistry C Vol -1

Solvothermal synthesis of Co_xFe_3−xO₄ spheres and their microwave absorption properties

Content Provider	Royal Society of Chemistry (RSC)
Author	Cao, Chuanbao Bai, Ju Chen, Zhuo Ji, Renlong Zhai, Huazhang
Copyright Year	2014
Abstract	CoxFe3−xO4 (x = 0–1) spheres are synthesized via a solvothermal reaction using ethylene glycol (EG) as a solvent. They are characterized, and the results show that the prepared spheres are mainly 300–500 nm in diameter and constituted by small grains. For the EG solution containing stoichiometric ingredients (atomic ratio of Co2+ : Fe3+ = 1 : 2), the obtained spheres are Co0.9Fe2.1O4 at 200 °C (sphere A) and Co0.74Fe2.26O4 (sphere B) at 300 °C, whose crystallites are 23 nm and 30 nm in size, respectively. VSM measurements reveal improved properties with sphere B. Variations of complex permittivity and permeability for different composite (75% mass ratio of spheres) have been studied as a function of frequency. The calculated reflectivity value indicates that the composite containing sphere A displays better microwave absorption capability. The minimum reflection loss reaches −41.089 dB at 12.08 GHz, with a matching thickness of 2 mm. The dielectric loss contributes even more than magnetic loss in the frequency range of 3–14 GHz. The synergistic effect of dual losses makes the submicrosphere a promising absorbent in X and Ku bands. The composite consisting of sphere B is inferior in dielectric properties owing to ferrous ion migration from octahedral to tetrahedral sites and due to the big crystallites lacking defects. After the calcination treatment of the spheres at 700 °C, the dielectric loss turns out to be low due to the disappearing Fe2+ ↔ Fe3+ pairs in adjacent octahedral sites and the loss of defects. Variations of the cobalt ratio in spheres can change the resonance frequency and crystallinity of the spheres and ultimately the minimum reflection loss and corresponding frequency band. The microwave absorption properties of mixed magnetite and cobalt ferrite spheres are influenced by the cationic stoichiometry and crystalline integrity.
Starting Page	5944
Ending Page	5953
Page Count	10
File Format	HTM / HTML PDF
ISSN	20507526
Volume Number	2
Issue Number	29
Journal	Journal of Materials Chemistry C
DOI	10.1039/c4tc00167b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	VSM Ku Ethylene glycol Solvent Stoichiometry Permittivity Semipermeable membrane Microwave Reflection loss Dielectric Ion Calcination Cobalt Nuclear magnetic resonance Magnetite Ferrite core
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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