High density ferrites

Claim 1

THE METHOD OF PRODUCING A FERRIMAGNETIC CUBIC FERRITE CERAMIC BODY HAVING A DENSITY GREATER THAN 90% OF THEORETICAL DENSITY AND HAVING UNIQUELY HIGH PERMEABILITY AND LOW COERCIVE FORCE WHICH CONSISTS ESSENTIALLY AT THE STEPS OF SUBJECTING TO PRESSURE A DRY POWDER OF FERRIMAGNETIC FERRITE SELECTED FROM THE GROUP CONSISTING OF MGFE204, MNFE204, ZNFE204, CUFE204, NIFE204, C0FE204 AND SOLID SOLUTIONS THEREOF AND HEREBY FORMING A POWDER BODY OF DESIRED SHAPE, SINTERING THE RESULTING PRESSED BODY IN A REDUCING ATMOSPHERE AND THEREBY FORMING A NON-MAGNETIC SECOND PHASE SOLID SOLUTION LOCATED PRINCIPALLY AT THE GRAIN BOUNDARIES AND DISPERSED THROUGHOUT THE INTERIOR OF THE RESULTING FERRIMAGNETIC CUBIC FERRITE BODY, AND THEREAFTER HEAT TREATING THE SAID RESULTING FERRIMAGNETIC CUBIC FERRITE BODY IN AN OXIDIZING ATMOSPHERE AT FROM 900* TO 1500* C. AND THEREBY CONVERTING ALL THE NON-MAGNETIC SECOND OHASE COMPONENT TO THE FERRIMAGNETIC FERRITE.