Synthesis and magnetic properties of octahedral ferrite NiχCo1−χ
Fe2O4 nanocrystals

• Authors: Nermin Kasapoglu , Bahar Birsöz , Abdülhadi Baykal , Yüksel Köseoglu , Muhammet Toprak
• Languages of publication: EN

Abstracts

EN

A series of Ni doped cobalt ferrite compounds with the formula Niχ Co1−χ Fe2O4 where x=0, 0.2, 0.4, 0.6, 0.8, and 1.0 were prepared using a hydrothermal method and subsequently sintered/annealed at 600 °C for 3 h. The influence of the Ni content on the lattice parameter, a, stretching vibration and the magnetization of specimens were subsequently studied. XRD and FTIR were used to investigate structure and composition variations. All samples were found to have a cubic spinel structure. SEM was used to study morphological variations. The results indicate that the average particle sizes are between 30–35 nm with a narrow size distribution along with nanocrystals forming of regular octahedrons. A decrease in the peak to peak line width and increase in resonance field with increasing Ni content were observed from ESR measurements. Based on ESR results, a core-shell type of formation was proposed where the core is made up of undoped CoFe2O4 and the shell is Ni2+ doped CoFe2O4. [...]

Keywords

EN

Octahedral nanocrystals; ferrites; core-shell structure; hydrothermal synthesis

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2007
• Volume: 5
• Issue: 2
• Pages: 570-580

Dates

published

1 - 6 - 2007

online

23 - 1 - 2007

Contributors

author

Nermin Kasapoglu

• Department of Chemistry, Fatih University, 34500, Buyukcekmece, Istanbul, Turkey

author

Bahar Birsöz

• Department of Chemistry, Fatih University, 34500, Buyukcekmece, Istanbul, Turkey

author

Abdülhadi Baykal

• Department of Chemistry, Fatih University, 34500, Buyukcekmece, Istanbul, Turkey

author

Yüksel Köseoglu

• Department of Physics, Fatih University, 34500, Buyukcekmece, Istanbul, Turkey

author

Muhammet Toprak

• Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA

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Identifiers

DOI

10.2478/s11532-007-0005-0