Nickel-iron spinel/reduced graphene oxide nanocomposites: Structural and mossbauer studies

Abstract

Ultrafine nickel ferrite and nickel ferrite/ reduced graphene oxide (rGO) nanocomposite have been synthesized by hydrothermal method. Structural and magnetic properties of the obtained materials have been studied. XRD studies revealed that the joint hydrothermal synthesis of nickel ferrite and graphene oxide reduction leads to decreasing of ferrite particles to 8-9 nm. Nor-malized pair distance distribution functions and the most pro-bable particle sizes were studied by SAXS method. The distri-bution of Fe3+ and Ni2+ cations between tetrahedral and octa-hedral sublattices was analyzed and transitions magnetic ordered state – spin glass like state - superparamagnetic state for ultrafine nickel ferrite were observed by Mossbauer spectros¬co¬py.