The preparation of Mn3O4 (hausmannite) (Mn1) nano-powder was prepared by mixmixing Manganese sulfate monohydrate (MnSO4.H2O, Panreac 0.2M) with ammonium hydroxide (NH4OH, Chemie LOBA 30%) then titratetitration of the solution with hydrogen peroxide (H2O2, MERCK 30%) from burette in a conical flask until adjustment of the pH at value 10 through the addition of ammonium hydroxide solution( duringsolution (during the mixing process, using Heatingheating magnetic stirrer for heating the reaction about 85oc and stirring it for 20 minutesminutes). The mixture was heated in the microwave oven for 30 minutes until complete dryness and formation the precipitates, then it was washed bywith distilled water and then filtered. The filtered precipitates were dried by microwave for 10 minutes.