Magnetic iron oxides nanoparticles obtained by mechanochemical reactions from different solid precursors

P. A. CALDERÓN BEDOYA; P. M. BOTTA; P. G. BERCOFF; M. A. FANOVICH

JOURNAL OF ALLOYS AND COMPOUNDS

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2021 vol. 860 p. 157892 - 157892

0925-8388

In this study, iron oxide nanoparticles (NPs) weresuccessfully prepared from three different reactive systems by usingmechanochemical synthesis. The effect of using iron salts with differentoxidation state and the addition of metallic Fe to the mixture reactive wasinvestigated. The influence of different mechanochemical treatments times onthe structural and magnetic properties of the obtained iron oxide NPs was alsostudied. Composition, crystal structure and morphology of the nanoparticleswere analyzed by XRD, Raman spectroscopy, SEM, TEM and DLS techniques. Theobtained crystalline NPs exhibited mean sizes of about 8?10 nm and agglomeratein clusters of about 300 nm. Also, magnetic properties as a function oftemperature and applied field were determined for the obtained iron oxide NPs,showing high magnetization in the whole temperature range. The resultsindicated that the presence of metallic Fe in the starting mixture plays acrucial role in the formation of spinel magnetic phases (magnetite/maghemite).Structural and magnetic results are consistent with the formation of maghemitein the studied samples.