Mossbauer study of microstructure and magnetic properties (Co, Ni)-Zr substituted Ba ferrite particles

The barium hexaferrites of M-type BaFe12-2x(Co,Ni)(x)ZrxO19 were synthesized by citrate precursor method in 0.0less than or equal toxless than or equal to0.6 range. For comparison, Ni-Zr compounds were also prepared by mechanical milling. Mossbauer measurements show that of Zr4+ ions have preference for 2b and 2a+4f(1) sites whereas Co2+ ions prefer 4f(2) and 12k positions. Different occupations were observed on Ni-Zr substitutions. The temperature coefficient of the coercivity, dH(c)/dT, was nearby to zero (0.01 kA/mdegreesC) for the Co-Zr substitutes and positive for the rest of the samples. A fast reduction of coercivity H-c with the increase in substitution level (370 to 150 kA/m) were underwent for all (Co, Ni) -Zr mixtures.