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Ce3+ and Dy3+ ion substituted cobalt and nickel ferrites (CoCexDyxFe2-2xO4, NiCexDyxFe2-2xO4 and CoCexFe2-xO4 (0 ≤ x ≤ 0.05)) with fine particles (9 ≤ D ≤16 nm) were synthesized by glycol-thermal method. XRD analysis of samples investigated confirmed single phase cubic spinel structure with no impurity peaks. Broad electron spin resonance (ESR) signals for cobalt substituted compounds reveal stronger dipole-dipole interactions between the particles and presence of the novel low field microwave absorption signals in addition to the broad high field signals. An increase in low field signals with increasing rare earth ion concentrations has been observed. Rare earth ion substituted nickel ferrites show narrow signals indicative of stronger super exchange interactions between magnetic moments with no evidence of low field non-resonant absorption. Results show significant modification of the magnetic properties of cobalt and nickel ferrite due to Ce3+ and Dy3+ rare earth ions substitutions.
| Apply for student award at which level: | MSc |
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| Consent on use of personal information: Abstract Submission | Yes, I ACCEPT |