Synthesis and Characterisation of Superparamagnetic MgFe{sub 2}O{sub 4} Nanoferrite

Journal Article · Mon Oct 15 04:00:00 EDT 2018 · Journal of Superconductivity and Novel Magnetism

DOI:https://doi.org/10.1007/S10948-018-4573-3· OSTI ID:22773739

Aroutchelvane, J. ^[1]; Okrasa, L. ^[2]; Chandrasekaran, G. ^[3]

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1. Defence Metallurgical Research Laboratory (India)
2. Lodz University of Technology, Department of Molecular Physics (Poland)
3. Pondicherry University, Department of Physics, School of Physical, Chemical and Applied Sciences (India)

Nanocrystalline MgFe{sub 2}O{sub 4} with crystallite size of 10.4 nm was synthesised using combustion method and characterised for structural, electrical, and magnetic properties. The powder X-ray diffraction analysis reveals the single-phase nature of MgFe{sub 2}O{sub 4}. The field emission scanning electron microscopy image shows the nanosized grains. The magnetic study reveals the superparamagnetic behaviour of MgFe{sub 2}O{sub 4} with saturation magnetisation value of 14.57 emu/g. The blocking temperature is determined using low-temperature magnetic measurement which is equal to 139 K. Electrical study shows that the value of AC conductivity at 1 Hz is 1.12 × 10{sup − 8} S/cm at 303 K and increases with frequency as well as temperature. The complex impedance analysis shows the grain and grain boundary resistance equal to 6.23 × 10{sup 6} Ω and 1.27 × 10{sup 7} Ω, respectively. The complex electric modulus analysis confirms the presence of two relaxation processes in nanocrystalline MgFe{sub 2}O{sub 4}.

• OSTI ID: 22773739
• Journal Information: Journal of Superconductivity and Novel Magnetism, Journal Name: Journal of Superconductivity and Novel Magnetism Journal Issue: 10 Vol. 31; ISSN 1557-1939
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMBUSTION
CRYSTALS
FERRITES
GRAIN BOUNDARIES
MAGNESIUM COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIZATION
NANOSTRUCTURES
RELAXATION
SCANNING ELECTRON MICROSCOPY
SUPERPARAMAGNETISM
SYNTHESIS
TEMPERATURE RANGE 0065-0273 K
X-RAY DIFFRACTION