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RESEARCH PRODUCT
Effect of antisite defects on the magnetic properties of ZnFe2 O4
D. JakovlevGundars MezinskisVambola KisandAndris ŠUtkaMikhael MaiorovMāris ZamovskisRainer PärnaJānis Kleperissubject
Materials scienceMagnetic momentScanning electron microscopeAnnealing (metallurgy)SpinelThermal decompositionAnalytical chemistrySurfaces and Interfacesengineering.materialCoercivityCondensed Matter PhysicsSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsZinc ferriteNuclear magnetic resonanceX-ray photoelectron spectroscopyMaterials ChemistryengineeringElectrical and Electronic Engineeringdescription
Magnetic zinc ferrite (ZnFe2O4) nanopowders were synthesized using the sol–gel autocombustion method. X-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements demonstrated that thermal decomposition of the 1-mm-thick xerogel layers in air formed monophasic spinel ferrite nanopowders with a particle size less than 30 nm. X-ray photoelectron spectroscopy (XPS) showed that the obtained reaction product contained antisite defects, with zinc ions occurring at the octahedral sites of the spinel structure. The concentration of antisite defects or inversion degree decreased when the relatively low annealing temperature was increased from 150 to 500 °C. Overall, the obtained ZnFe2O4, which is usually antiferromagnetic (exhibits no magnetic moment), demonstrated high saturation magnetization (60.7 emu g−1), and coercive force (56 Oe). This was due to the presence of the antisite defects in the structure.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-06-21 | physica status solidi (a) |