Synthesis, structural, magnetic and electrical properties of Co{sub 1−x}Zn{sub x}Fe{sub 2}O{sub 4} (x = 0.0, 0.2) nanoparticles
- Chemical Engineering Department, Istanbul University, 34320 Avcılar, Istanbul (Turkey)
- Division of Functional Materials, KTH-Royal Institute of Technology, SE16440 Stockholm (Sweden)
- Department of Chemistry, Fatih University, 34500 B. Cekmece, Istanbul (Turkey)
- TUBITAK-UME, National Metrology Institute, Gebze, 41470 Kocaeli (Turkey)
Graphical abstract: The variations of imaginary part of dielectric permittivity (ε″) of TEG@Co{sub 1−x}Zn{sub x}Fe{sub 2}O{sub 4} nanocomposite as a function of temperature and frequency for (A) x = 0.0 and (B) x = 0.2. Display Omitted Highlights: ► Nearly monodisperse Zn{sub x}Co{sub 1−x}Fe{sub 2}O{sub 4} nanocomposite were prepared via hydrothermal method. ► The ac conductivity showed a temperature dependent behavior at low frequencies. ► dc conductivity of Co{sub 0.8}Zn{sub 0.2}Fe{sub 2}O{sub 4} nanoparticle are found to obey the Arrhenius plot. ► Also these materials may be used in electronic devices and microwave devices. -- Abstract: Co{sub 1−x}Zn{sub x}Fe{sub 2}O{sub 4} spinel nanoparticles with Zn concentrations of x = 0.0, 0.2 were prepared by a hydrothermal route in the presence of triethylene glycol (TEG). The structural, magnetic, electrical and dielectric properties of the prepared nanoparticles were studied. The XRD results confirmed the formation of single spinel ferrite structure with crystallite size 9 and 10 nm for x = 0.0 and 0.2 compositions respectively. The lattice parameter (a) increased with increasing Zn concentration. Temperature and frequency dependent electrical and dielectric properties of the prepared ferrites have also been investigated. Our findings show that overall conductivity of Co{sub 0.8}Zn{sub 0.2}Fe{sub 2}O{sub 4} nanoparticle is lower than that of CoFe{sub 2}O{sub 4} and roughly in the range of 10{sup −11}–10{sup −7} S cm{sup −1} depending strongly temperature and frequency owing to the formation of stable electric bonds between the Zn{sup 2+} and Fe{sup 2+} ions, which localizes Fe{sup 2+} charge carriers. The ac conductivity showed a temperature dependent behavior at low frequencies and temperature independent behavior at high frequencies, which is an indication of ionic conductivity. dc conductivity of Co{sub 0.8}Zn{sub 0.2}Fe{sub 2}O{sub 4} nanoparticle are found to obey the Arrhenius plot and can be classified into two regions over with activation energy of 0.113 and 0.163 eV in the ranges of 20–40 °C and 70–120 °C, respectively when CoFe{sub 2}O{sub 4} has an activation energy of 0.245 eV.
- OSTI ID:
- 22215836
- Journal Information:
- Materials Research Bulletin, Vol. 48, Issue 2; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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