Characterization of nanoparticulated phases in the manganese oxo/hydroxide system obtained in supercritical water: Optimized conditions for selected compositions

The synthesis of different phases in the manganese oxi-hidroxyde system has been achieved by using supercritical water from the manganese (II) acetate as precursor, using only two high pressure pumps. The synthesis conditions to obtain the Mn(OH)2 and Mn3O4 phases have been optimized concerning the temperature and the ratio between manganese solution and water flow rates as key parameters. All phases have been microstructurally characterized in features such as size, shape, size distribution and crystallinity. The magnetic response has been evaluated from magnetization experiments.