Rogers Corporation
MULTIPHASE FERRITES AND COMPOSITES COMPRISING THE SAME

Abstract:

In an aspect, a multiphase ferrite comprises a Co.sub.2W phase that is optionally doped with Ru; a CFO phase having the formula Me.sub.r"Co.sub.1-rFe.sub.2+zO.sub.4, wherein Me" is at least one of Ni, Zn, or Mg, r is 0 to 0.5, and z is -0.5 to 6 0.5; and a CoRu-BaM phase having the formula BaCo.sub.x+yRu.sub.yFe.sub.12-(2/3)x-2yO.sub.19, wherein x is 0 to 2, y is 0.01 to 2; and the Ba can be partially replaced by at least one of Sr or Ca. In another aspect, a composite can comprise a polymer and the multiphase ferrite. In yet another aspect, a method of making a multiphase ferrite can comprise mixing and grinding a CoRu-BaM phase ferrite and a CFO phase ferrite to form a mixture; and sintering the mixture in an oxygen atmosphere to form the multiphase ferrite.