AN X-RAY-DIFFRACTION AND MOSSBAUER-SPECTROSCOPY STUDY OF THE REACTIONBETWEEN HEMATITE AND ALUMINUM ACTIVATED BY BALL-MILLING

The reaction between hematite and aluminum in presence of allumina as diluent activated by Ball Milling powder mixtures in different energet ic conditions has been investigated. To this purpose, the powders at d ifferent milling times have been characterized by X-ray Diffraction an d Mossbauer Spectroscopy. A self-substained combustion reaction was ob served when the strongest energetic conditions of milling were adopted . The intermediate products of the reaction also depend on the energet ic conditions: the formation of hercynite is favoured by the use of st rong energetic conditions while the formation of an Fe-Al alloy was ob served when a low energy per single hit is transferred to the powders.