Effect of La substitution on the structural and chemical properties of Barium hexaferrite via Mossbauer spectroscopy

Abstract M-type Barium hexaferrite is a famous hard magnetic material with hexagonal crystal structure. La substituted hexaferrite, Ba (1-x) (x) Fe 12 O 19 , (where, x = 0.25 and 0.30) were synthesized using ball milling followed by sintering at 1300 °C for 5 hours. X-ray diffraction patterns reveal the formation of single-phase magnetoplumbite structure barium which belongs to P6 3 /mmc space group. Mossbauer spectroscopic studies carried out study phase, effect doping on valency atom, charge distribution in prepared samples. spectra fitted sextets, shows there sublattices present system. From fitting spectrum, it observed that, no 2+ ion even if levels are as high 30%, expected that 3+ changes its valance maintain neutrality. However, an increase s-electron density number sites doping. Quadrupole splitting values spherical all except 2b, due asymmetric nature bipyramidal site. Slightly varied hyperfine k 4f1 substitution.