in order to obtain a sintered oxidic permanent magnetic material with improved properties , a mixture is prepared which forms a magnet having a composition defined by the formula mefe 2 2 + fe 16 3 + o 27 , where me is one or more of the metals barium or strontium , optionally partly replaced by clacium and / or lead . a prefired product having a ferrous iron content which corresponds to the stoichiometric ferrous content of the product composition is sintered at a temperature between 1160 ° and 1250 ° c . in an atmopshere having such an oxygen concentration that substantially no oxygen exchange takes place between the product and the atmosphere .