Speaker
Description
CaxZn1-xFe2O4 (x=0.0-1.0) fine particles with particle size ranging from 8nm to 13 nm were investigated by XRD, TEM, FTIR, and electron spin resonance measurements. XRD spectra revealed (220), (311), (400), (420), (511), and (440) crystal planes characteristics of cubic spinel phase with no impurity peaks. A slight reduction in particle size with the increasing Ca2+ ion concentration observed. Electron spin resonance spectra showed single line signals relating well with cubic phase revealed by XRD data. Ca2+ ions doping appear to have significant effects on the signal line widths and resonance magnetic fields. ESR signals of the samples with composition with x is equal/greater than 0.2 show hysteresis between signals recorded on cycling the magnetic fields. Broadening of the ESR signals and the shifts towards lower resonance magnetic fields with increasing Ca content have been explained based on increasing dipole-dipole interaction between the particles and Lande g factors. the evolutions of the magnetic parameters such as line widths, resonance magnetic fields and spin relaxation time as a function of composition and particle size are also presented.
| Apply for student award at which level: | MSc |
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| Consent on use of personal information: Abstract Submission | Yes, I ACCEPT |