Synthesis and characterization of Co0.8Fe2.2O4 nano ferrite

International Conference on Recent Trends in Physics 2016

Raghuvanshi, S.^1 ; Kane, S.N.^1 ; Lalla, N.P.^2 ; Reddy, V.R.^2

Magnetic Materials Laboratory, School of Physics, Devi Ahilya University, Khandwa Road Campus, Indore

452001, India^1

UGC-DAE CSR, University Campus, Khandwa Road, Indore

452001, India^2

关键词: Annealed samples;    Grain diameter;    Nano-ferrites;    Sol-gel auto-combustion;    Spinel phase;    Synthesis and characterizations;    Thermal-annealing;    Unit-cell volume;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/755/1/012049/pdf
DOI  :  10.1088/1742-6596/755/1/012049

来源: IOP

【 摘 要 】

Co0.8Fe2.2O4nano ferrite has been synthesized by sol gel auto-combustion method. X-ray diffraction (XRD) and Mossbauer spectroscopy were used to characterize the synthesized as burnt and thermally annealed (600oC for 3 hours) samples. Both XRD and Mossbauer measurements confirm the formation of spinel phase with Scherrer's grain diameter (Ds) ≈ 37 nm. Presence of α-Fe and, Fe2O3was also observed. Thermal annealing induced decrease of ρxrd(from 5267.9 to 5262.7 Kg/m3) for the annealed samples is ascribable to the fact that, increase of unit cell volume overtakes the increase in mass of the unit cell. Comparison of dry gel and thermally annealed sample shows that in dry gel, B site is more populated with Fe ions, whereas thermal annealing leads to migration of Co from A to B site with simultaneous migration of Fe from B to A site, thus dropping the Neel magnetic moment. Bond angle values clearly reveal that thermal annealing leads to strengthening of B-O-B interaction with simultaneous wreaking of A-O-B, and, A-O-A interaction.