A series of pure polycrystalline M-type hexagonal ferrite with the
formula BaCo0.5xZn0.5xTixFe12-2xO19 ( x = 0.0, 0.4, 0.8, 1.2, 1.6, 2.0) has been
synthesized and studied by x-ray diffraction and Mössbauer spectroscopy. With
increasing substitution the Mössbauer 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
indicate that for small values of x, substitutions occurs preferentially in 4f1 and
4f2 sites indirectly affecting Fe in the 12k site.