Synthesis and magnetic properties of zinc ferrite from mechanochemical and thermal treatments of Zn-Fe3O4 mixtures

PABLO M. BOTTA; PAULA G. BERCOFF; HÉCTOR R. BERTORELLO; ESTEBAN F. AGLIETTI; JOSÉ M. PORTO LÓPEZ

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Año: 2003 vol. 360 p. 146 - 152

0921-5093

The preparation of ZnFe2O4 from mechanochemically activated reactive mixtures Zn-Fe3O4 is studied. The physicochemical and structural evolution of the system is analyzed by X-ray diffraction (XRD), vibrating sample magnetometry (VSM), differential thermal analysis (DTA) and scanning electron microscopy (SEM).The activated mixtures reacted towards the formation of ZnFe2O4 at lower temperatures than the non-activated ones. In addition, thermal treatments as a function of time revealed a non-expected magnetic behavior of some mixtures. In order to interpret this observation, a qualitative diffusional reaction model is proposed.