Electron spin resonance study of NiFe2O4 nanosolids compacted under high pressure
- 15 July 1996
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 80 (2), 719-723
- https://doi.org/10.1063/1.362879
Abstract
In this article, NiFe2O4 nanosolids are prepared by compacting nanoparticles, synthesized by the coprecipitation method, under different pressures. The variations of structure and interface states of the NiFe2O4 nanosolids with compacting pressures are studied by x‐ray diffraction and electronic spin resonance (ESR). It is found that the crystal structure of the nanosolids has not changed under pressure up to 6.0 GPa, but the linewidth and g‐factor values of their ESR spectra increased significantly with increasing pressure up to 4.5 GPa and then decreased slightly with further increase of pressure. These variations are discussed in terms of the changes of interparticle magnetic dipole interaction and superexchange interaction in NiFe2O4 nanosolids under different pressures. The experimental results suggest that 4.5 GPa is the optimum forming pressure, under which the NiFe2O4 nanoparticles can be compacted into a dense solid with their structure and nanoproperties still preserved.Keywords
This publication has 10 references indexed in Scilit:
- Structure and properties of nanocrystalline materialsBulletin of Materials Science, 1994
- Electron paramagnetic resonance study of ionic water-based manganese ferrite ferrofluidsJournal of Magnetism and Magnetic Materials, 1993
- Magnetization and magnetic resonance studies of ultrafine Ho3Fe5O12 and Yb3Fe5O12Journal of Magnetism and Magnetic Materials, 1990
- Nanocrystalline materialsProgress in Materials Science, 1989
- Synthesis and characterization of ultrafine cobalt ferritesIEEE Transactions on Magnetics, 1989
- A novel low-temperature preparation of several ferrimagnetic spinels and their magnetic and Mössbauer characterizationJournal of Applied Physics, 1988
- ESR and Mössbauer studies of the precipitation process of various ferrites from silicate glassesJournal of Materials Science, 1984
- Superparamagnetic effects in the ferromagnetic resonance of silica supported nickel particlesThe Journal of Chemical Physics, 1981
- Magnetic structure of small NiFe2O4 particlesJournal of Applied Physics, 1981
- ESR study of NiFe2O4 precipitation process from silicate glassesJournal of Applied Physics, 1979