A Crystallographic and Moessbauer Spectroscopic Study of BaCo0.5xZn0.5xTix Fe12-2xO19 (M-Type Hexagonal Ferrite)

A series of pure polycrystalline M-type hexagonal ferrite with the formula BaCo0.5xZn0.5x TixFe12-2xO19 (x=0.0, 0.4, 0.8, 1.2, 1.6, 2.0) has been synthesized and studied by X-ray diffraction and Moessbauer spectroscopy. With increasing substitution the Moessbauer spectra change from magnetically ordered (x=0) towards magnetically ordered with strong line broadening (x=0.4 to 1.6) to nonmagnetic (x=2.0), due to decreasing of Curie temperatures. Differential line broadening and relative area of components indicates that for small values of x, a substitution occurs preferentially in 4f1 and 4f2 sites indirectly affecting Fe in the 12k site.