Synthesis of hausmannite (Mn₃O₄) via sonochemical route and characterization

Hausmannite (Mn₃O₄) synthesized via sonochemical method using manganese sulphate monohydrate as precursor and ammonium hydroxide as basic medium. Ammonia solution added to the aqueous solution of manganese sulphate monohydrate to maintain pH around 9. The resulting solution sonicated for three hours in pulse mode. The obtained product characterized with PXRD, TEM, SAED, EDX, BET and TGA. The XRD pattern of the product matches to tetragonal structure of Mn₃O₄and the crystallite size of the obtained product was 28 nm.The morphology of the particles was not uniform and average particle size found to be around 55 to 60 nm. Selected area electron diffraction studies shown that the obtained particles were crystalline in nature. The BET surface area and pore volume of the particles were 23.681 m²/g and 0.138 ml/g respectively. TGA studies have shown that decomposition of Mn₃O₄not occurred over the temperature range of 30 to 900 °C.