Features of the Cation Distribution and Magnetic Properties of BaFe 12 − x Y x O 19 Hexaferrites

Using Mossbauer spectroscopy, magnetometry and X-ray diffraction, we have studied the BaYxFe12 – xO19 hexaferrite (0.1 ≤ x ≤ 1.2). The low isomorphic capacitance of hexaferrite is shown, which leads to phase separation with the formation of ВаFe2O4 and Y3Fe5O12 for x = 0.6. Mossbauer spectroscopy data have shown that, in the studied range of substitutions, Y3+ ions enter the 12k position with the formation of a nonequivalent 12k' position due to the breaking of two Fe(12k)–O–Fe(12k) magnetic bonds in the 12k octahedron triad with their replacement by Fe(12k)–O–Y (12k). The BaYxFe12 – xO19 hexaferrite has been shown to be less magnetically hard than BaFe12 – xAlxO19.