PARTICULATE MAGNETIC OXIDE COMPOSITIONS WITH LACUNAR SPINEL TYPE STRUCTURE, THEIR PREPARATION AND THEIR APPLICATION

摘要

P COMPOSITIONS OF PARTICULATE MAGNETIC OXIDES BASED ON IRON OXIDE III AND OXIDE OF AT LEAST ONE DIVALENT METAL SELECTED AMONG COBALT, IRON, COPPER, ZINC, MAGNESIUM, NICKEL, MANGANESE AND CADMIUM, CHARACTERIZED BY THE FACT THAT THE SAME COMPOSITIONS CONTAIN, IN ADDITION, IN THE FORM OF OXIDE, AT A REASON OF 0.2 TO 5 BY WEIGHT IN RELATION TO THE TOTAL WEIGHT AT LEAST ONE ADJUVANT OR SUBSTITUTE CHOSEN AMONG ALKALINE METALS, METALS ALCALINO-TERREUX, THE BORUS, THE ELEMENTS OF COLUMNS 3, 4 AND 5 OF THE PERIODIC CLASSIFICATION OF ELEMENTS HAVING A MOLECULAR MASS SUPERIOR TO 26, THE TRANSITION METALS 3D AND 4D OTHER THAN THOSE ALREADY MENTIONED, AND RARE EARTH WHEREAS AN ALKALINE METAL IS PRESENT, AT LEAST ANOTHER ADJUVANT OR SUBSTITUTE IS ALSO PRESENT, AND BY THE FACT THAT THE SAID COMPOSITIONS HAVE A LACUNAR SPINEL TYPE STRUCTURE, THEIR PREPARATION AND THEIR APPLICATION. /P