Samiksha Verma, Puneet Sharma, O. P. Pandey, Andrea Paesano Jr. e An-Cheng Sun

IEEE TRANSACTIONS ON MAGNETICS – Volume: 50; Number: 1; Page: 2101004; DOI: 10.1109/TMAG.2013.2278373

M-type Barium hexaferrite (BaFe12O19) with substitution of Ba2+ by rare earth metal La3+ were prepared by solid state synthesis method from as-prepared powder of barium monoferrite (Ba1-xLaxFe2O4) (x=0.0, 0.1 and 0.2). The structural and magnetic properties of Ba1-xLaxFe12O19 were investigated by X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and Mössbauer spectroscopy. The refined XRD patterns suggests the formation of single phase hexaferrite. With increased La substitution (x), the saturation magnetization increased and reached maximum at x = 0.1 and decreased at x = 0.2, without any noticeable change in coercivity. Fitted Mössbauer spectra of Ba1-xLaxFe12O19 showed increase in hyperfine field and a transition from Fe3+ ion to Fe2+ ion at 2b site.The present work demonstrates a new methodology for two stage substitution.