Ultrasound effects on metallic (Fe and Cr); iron sesquioxides (α-,γ-Fe2O3); calcite; copper, lead and manganese oxides as powders

Abstract Different kind of materials, as powders, were submitted to ultrasound after mixing in water, dodecane or dilute acetic acid (5%). After treatment, firstly a decrease of particle size, and secondly the formation of unexpected and unknown compounds was observed on a mesoscopic scale (CaO from CaCO 3 for example). For iron and iron oxides, it was found that the magnetic properties (susceptibility and effective magnetic moment) were changed slightly. A shift in the Morin temperature transition for α-Fe 2 O 3 was attributed to the formation of impurities. For inorganic oxides (Cu 2 O, PbO, Pb 3 O 4 and Mn 3 O 4 ) sonicated in dilute acetic acid, the formation of metallic acetates is easily achieved and it is rapid (10 s for PbO).