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Electron Spin Resonance Study of ZnxCo1−xFe2−xAlxO4 Nanoparticles

  • J. Z. MsomiEmail author
  • T. Moyo
  • S. Mahule
  • V. V. Srinivasu
Original Paper
  • 28 Downloads

Abstract

Zn- and Al-substituted cobalt ferrite ZnxCo1−xFe2−xAlxO4 (0 \(\leq x \leq \) 0.9) with particle size in the range of 6–13 nm were synthesized by glycol-thermal reaction. The compounds were investigated by electron spin resonance (ESR) measurements. CoFe2O4 (x = 0) shows a broad ESR signal associated with magnetic dipole-dipole interactions among particles which is highly sensitive to the Zn and Al ion concentrations. Narrower ESR signals in Zn- and Al-doped samples are attributed to the weakening of super-exchange interactions. ESR and magnetization measurements reveal a reduction in magnetization with increasing particle size. This is explained on the basis of the redistribution of Zn2+ ions in both tetrahedral (A) and octahedral (B) sites in fine powders.

Keywords

Ferrites Nanoparticle Magnetization Electron spin resonance 

Notes

Funding Information

J. Z. Msomi wishes to thank the National Research Foundation (NRF) and the University of Zululand for financial support.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • J. Z. Msomi
    • 1
    Email author
  • T. Moyo
    • 2
  • S. Mahule
    • 3
  • V. V. Srinivasu
    • 3
  1. 1.Department of Physics and EngineeringUniversity of ZululandKwadlangezwaSouth Africa
  2. 2.School of Chemistry and PhysicsUniversity of KwaZulu-NatalKwaZulu-NatalSouth Africa
  3. 3.Department of PhysicsUniversity of South AfricaJohannesburgSouth Africa

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