Ilmenite-type complex manganese oxides and preparation thereof

Claim 1

THE PROCESS FOR PREPARING A FERROMAGNETIC CRYSTALLINE COMPLEX OXIDE OF MANGANESE AND AT LEAST ONE METAL OF THE GROUP CONSISTING OF NICKEL AND COBALT, SAID OXIDE HAVING AN ILMENITE-TYPE CRYSTAL STRUCTURE WHICH COMPRISES HEATING AT ABOUT 450-800*C., AT A PRESSURE OF LESS THAN ABOUT 500 ATMOSPHERES AND IN THE PRESENCE OF OXYGEN A MIXTURE OF (1) A MANGANESE SALT SELECTED FROM THE GROUP CONSISTING OF POTASSIUM PERMANGANATE AND MANGANESE NITRATES, OXALATES, HALIDES AND CARBONATE AND (2) AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF NICKEL AND COBALT NITRATES, OXALATES, HALIDES AND CARBOANTES, THE ATOMIC RATIO OF MANGANESE TO THE OTHER METAL IN THE MIXTURE BEING BETWEEN 1:1 AND 2:1 WHEN THERE ARE SALTS OF ONLY TWO METALS THEREIN AND THE MANGANESE SALT FORMING 15-85 MOLE PERCENT OF THE MIXTURE WHEN THERE ARE SALTS OF THREE METALS THEREIN.