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Published in:
01-08-2013
Influence of oxidizer to fuel ratio on structural and magnetic properties of Mn–Zn ferrite nanoparticles
Published in: Journal of Materials Science: Materials in Electronics | Issue 8/2013
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Abstract
Nanoparticles of Mn0.5Zn0.5Fe2O4 are prepared using sol–gel auto-combustion method with a view to understand the role of oxidizer to fuel ratio [OFR (ϕ
e)]. The selected ratios are categorized as fuel lean (ϕ
e > 1), stoichiometric (ϕ
e = 1), and fuel rich (ϕ
e < 1), composition. Thermal study using TG–DTA on the samples confirm the impact of fuel on the decomposition process for three OFRs. X-Ray diffraction study unravels the formation of cubic ferrite with an enhancement of particle size from 30 to 46 nm. Fourier transform infrared spectroscopic spectra reveal the presence of tetrahedral and octahedral sites in the cubic spinel matrix and shift in the corresponding frequencies. The magnetic hysteresis parameters measured using vibrating sample magnetometer help to understand the increase of magnetic properties when OFR decreases. The magnetic domains change from multi to pseudo single domain and interestingly different spin canting as OFR is varied.