34.  Cobalt Ferrite Nanostructures Obtained by Chemical Coprecipitation and Hydrothermal Method

Authors: M. Bradiceanu, P.Vlazan, S. Novaconi, I. Grozescu, P. Barvinschi


Abstract:

Cobalt ferrite (CoxFe3-xO4) is a cubic ferrite with inverse spinel nanodimensional structure, its particles being very special ones due their magnetically interesting properties. Cobalt ferrite nanopowders were obtained using the chemical coprecipitation, an economical synthesis way of ultrafine CoxFe3-xO4 of different compositions (where x = 0.25, 0.4, 0.5, 0.8) and sizes (6-10nm) and hydrothermal method. We have obtained a precipitate with magnetic properties and color nuance varying from cinnamon to dark brown using the coprecipitation technique and brown-black by hydrothermal technique. The powders were characterized by XRD measurements. The main advantage of these two synthesis methods consist in dimensional control of the particle dimensions and form according to the desired magnetic properties. Besides hydrothermal way provides a higher degree of crystallinity and most pronounces magnetic properties.


Keywords: nanostructure, cobalt ferrite, coprecipitation, hydrothermal

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