Maghemite Interparticle Interactions in γ -Fe 2 O 3 /Ag nanocomposites

Author： Soares J.  

Publisher： Springer Publishing Company

ISSN： 1557-1939

Source： Journal of Superconductivity and Novel Magnetism, Vol.26, Iss.7, 2013-07, pp. : 2467-2470

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Abstract

Maghemite and silver nanoparticles were prepared using the ionic coordination reaction technique. X-ray diffractograms (XRD) show that all the samples have a high degree of purity. The average particle sizes obtained by XRD and transmission electron microscopy (TEM) vary from 9 to 13 nm for the γ-Fe2O3 particles and from 130 to 142 nm for the Ag particles. The magnetic properties of the samples have been studied by room-temperature DC magnetization and Mössbauer spectroscopy. These measurements indicate the presence of γ-Fe2O3 particles with interparticle interactions of varying strength, resulting in three magnetic regimes: superparamagnetic, superparamagnetic with interactions, and blocked with interactions.

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