Co{sub 1−x}Zn{sub x}Fe{sub 2}O{sub 4} (0 ≤ x ≤ 1) nanocrystalline solid solution prepared by the polyol method: Characterization and magnetic properties

Journal Article · Sat Sep 15 00:00:00 EDT 2012 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2012.04.080· OSTI ID:22215749

Tahar, L. Ben ^[1]; Basti, H. ^[1]; Herbst, F. ^[2]; Smiri, L. S. ^[1]; Quisefit, J. P. ^[3]; Yaacoub, N.; Grenèche, J. M. ^[4]

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1. SSMI (99/UR12-30), Faculté des Sciences de Bizerte, 7021 Jarzouna (Tunisia)
2. ITODYS, Université Paris Diderot, CNRS UMR-7086, 75205 Paris (France)
3. LISA, Université Paris Diderot, Université Paris 12, CNRS UMR-7583, 75205 Paris (France)
4. LUNAM, Université du Maine, IMMM CNRS UMR-6283, 72085 Le Mans (France)

Highlights: ► Co–Zn ferrite nanoparticles were produced by soft chemistry. ► Cation distribution deviation from the thermodynamically stable one was evidenced. ► The magnetic characteristics were affected and differ from those of bulks. -- Abstract: Highly crystalline stoichiometric Co{sub 1−x}Zn{sub x}Fe{sub 2}O{sub 4} (0 ≤ x ≤ 1) nanoparticles were successfully synthesized by the polyol process. X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), transmission electron microscopy (TEM), infrared spectroscopy (IR), zero-field {sup 57}Fe Mössbauer spectrometry and magnetic measurements using a SQUID magnetometer were employed to investigate the effect of the substitution of Zn{sup 2+} ions for Co{sup 2+} ones on the structure, and the magnetic properties of the cobalt ferrite, CoFe{sub 2}O{sub 4}. The unit cell parameter almost increases linearly with increasing Zn concentration, x, following Vegard's law. The red and blue shifts observed for the metal-oxygen ν{sub 1} and ν{sub 2}IR vibration bands, respectively, were consistent with the preferential entrance of Zn{sup 2+} ions in tetrahedral sites. Besides, detailed magnetic investigation in correlation with the cation distribution has been reported. All the particles exhibit superparamagnetic behaviour at room temperature. In addition, the magnetic characteristics (blocking temperature, saturation magnetization, coercivity, Curie temperature) clearly depend on the chemical composition and cation distribution. Both the blocking temperature and Curie temperature decrease drastically with Zn composition, x, increase. Further, the saturation magnetization follows an almost bulk-like behaviour with values notably larger than that of the bulk, mainly attributed to cation distribution deviation.

• OSTI ID: 22215749
• Journal Information: Materials Research Bulletin, Vol. 47, Issue 9; 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

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION SPECTROSCOPY
CATIONS
CHEMICAL COMPOSITION
COBALT
COBALT IONS
COBALT OXIDES
CRYSTALS
CURIE POINT
FERRITE
FERRITES
INFRARED SPECTRA
MAGNETIC PROPERTIES
NANOSTRUCTURES
SOLID SOLUTIONS
SQUID DEVICES
SUPERPARAMAGNETISM
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY FLUORESCENCE ANALYSIS
ZINC IONS