Cation distribution in bismuth-doped M-type barium hexaferrite

Abstract

Moessbauer studies were conducted on Bi-doped barium ferrites BaFe12-xBixO19(x = 0, 0.1, 0.2, 0.3, 0.4, and 0.6) with special attention paid to the behavior of the line widths in the Moessbauer sextets. Assuming that the broadening of the line widths in the various sextets is due to increases in the fluctuations in the hyperfine field (acting on a Fe ion in given site) caused by the introduction of the Bi ions into the neighboring Fe sites, the observed broadening of the lines belonging to the 4fviand 4e patterns indicated that the impurity ions were entering into the 4e and 4fvisites. The initial decrease in Mswould arise if the Bi ions first substituted in the 4fviand then into the 4e sites as more Bi is added.