Manganese-zinc ferrite

Claim 1

A METHOD OF PRODUCING MANGANESE FERROSPINELS FOR USE AS MAGNETIC MEMORY ELEMENTS WHICH BODIES HAVE A HIGH DEGREE OF HYSTERESIS LOOP SQUARENESS AND ARE FORMED FROM COMPOSITIONS CONSISTING ESSENTIALLY OF ABOUT 38.7 TO 43.5 MOL PERCENT FE2O3, ABOUT 51.6 TO 58.4 MOL PERCENT, NO AND ABOUT 0-8.8 MOL PERCENT OF AT LEAST ONE METALLIC OXIDE SELECTED FROM THE GROUP CONSISTING OF CHROMIUM, MAGNESIUM, COPPER AND NICKEL COMPRISING MIXING SAID OXIDE CONSTITUENTS, MOLDING THE MIXTURE INTO A BODY, FIRING SAID BODY AT A SINTERING TEMPERATURE OF ABOUT 1200*-1500*C. TO FORM THEREBY A FERROSPINEL PHASE AND THEREAFTER REDUCING THE TEMPERATURE OF SAID BODY IN AN OXIDIZING ATOMSPHERE TO WITHIN THE RANGE OF ABOUT 950*-1050*C. AND HOLDING FOR UP TO 16 HOURS TO FORM AN A-FE2O3 PHASE IN THE SKIN REGION OF SAID BODY RAPIDLY AND QUENCHING SAID BODY TO ROOM TEMPERATURE, PREFERABLY IMMEDIATELY FROM THE LOWER OF SAID LATTER TEMPERATURE RANGE TO ARREST FURTHER DEVELOPMENT OF SAID A-FE2O3 PHASE.

Claim 2

A METHOD OF PRODUCING MANGANESE FERROSPINELS FOR USE AS MAGNETIC MEMORY ELEMENTS WHICH BODIES HAVE A HIGH DEGREE OF HYSTERESIS LOOP SQUARENESS AND ARE FORMED FROM COMPOSITIONS CONSISTING ESSENTIALLY OF ABOUT 38.7 TO 43.5 MOL PERCENT FE2O3, ABOUT 51.6 TO 58.4 MOL PERCENT, NO AND ABOUT 0-8.8 MOL PERCENT OF AT LEAST ONE METALLIC OXIDE SELECTED FROM THE GROUP CONSISTING OF CHROMIUM, MAGNESIUM, COPPER AND NICKEL COMPRISING MIXING SAID OXIDE CONSTITUENTS, MOLDING THE MIXTURE INTO A BODY, FIRING SAID BODY AT A SINTERING TEMPERATURE OF ABOUT 1200*-1500*C. TO FORM THEREBY A FERROSPINEL PHASE AND THEREAFTER REDUCING THE TEMPERATURE OF SAID BODY IN AN OXIDIZING ATOMSPHERE TO WITHIN THE RANGE OF ABOUT 950*-1050*C. AND HOLDING FOR UP TO 16 HOURS TO FORM AN A-FE2O3 PHASE IN THE SKIN REGION OF SAID BODY RAPIDLY AND QUENCHING SAID BODY TO ROOM TEMPERATURE, PREFERABLY IMMEDIATELY FROM THE LOWER OF SAID LATTER TEMPERATURE RANGE TO ARREST FURTHER DEVELOPMENT OF SAID A-FE2O3 PHASE.