Magnets of the ferrite type economic and pharmacological improved

摘要

Ferritic type magnets comprise a magnetoplumbite phase compound with a global performance index GIP of Br + 0.5 (Br is the remanent induction, as mT) and Hk of at least 580, preferably 585. Hk corresponds to the field H (kA.m) for B that is 0.9Br. Ferritic type magnets comprise a magnetoplumbite phase of formula (I). M1-xRxFe12-yTyO19 (I) M = Sr, Ba, Ca or Pb; R = rare earth metal or Bi; T = Co, Mn, Ni or Zn; x = 0.15-0.42; and alpha = y/x that is 0.5-0.9. The ferrite magnet has a reduced amount of element T and a global performance index GIP of Br + 0.5 (Br is the remanent induction, as mT) and Hk of at least 580, preferably 585. Hk corresponds to the field H (kA.m) for B that is 0.9Br. Independent claims are included for the preparation and use of the magnets.