https://doi.org/10.1007/s100510050801
Nanoparticles of CoxFey☐zO4: Synthesis and superparamagnetic properties
1
Laboratoire
Structure et Réactivité
des Systèmes Interfaciaux,
Université Pierre et Marie Curie (URA CNRS 1662) ,
B.P. 52,
4 place Jussieu, 75005 Paris, France
2
CEA-DSM-DRECAM, Service de Chimie Moléculaire,
CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
3
CEA-DSM-DRECAM, Service de Physique de l'État Condensé, CEA Saclay,
91191 Gif-sur-Yvette Cedex, France
Corresponding author: a pileni@sri.jussieu.fr
Received:
3
February
1998
Published online: 15 June 1999
By using oil in water micelles, cobalt ferrite particles having an average diameter around 3 nm were synthetised. These nanoparticles are characterized by the presence of cation vacancies and no Fe(II) is observed, as it has been described in literature previously. Chemical interfacial treatment allows to coat the particles with citrate derivatives. The magnetic properties of uncoated and coated particles strongly diluted in a polymer substrate are compared by magnetization measurements and 57Fe Mössbauer spectroscopy. The anisotropy constant is shown to be independent of coating, whereas the magnetization is found to be larger in the uncoated particles.
PACS: 75.50.Tt – Fine-particle systems / 76.80.+y – Mössbauer effect; other γ-ray spectroscopy / 75.30.Cr – Saturation moments and magnetic susceptibilities
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999