Abstract
In this work, preferential site occupation in La–Co-substituted barium hexaferrites was systematically investigated by micro-Raman and Mossbauer spectroscopy. The effect of substitution on the magnetic properties was studied by vibrating sample magnetometer. Raman studies showed redshift in $2a$ , $2b$ , and $4f_{2}$ sites with Co and La substitution. The decrease in isomer shift and the relative sub-spectral area suggest that Co2+ ions preferably occupy $2a$ and $2b$ sites for Co-substituted sample. For La–Co substitution, Co also occupies $4f_{2}$ site as evidenced by the reduction in hyperfine field. Anisotropic field calculated by the law of approaching saturation was found to decrease with substitution. Curie temperature showed a strong dependence on La and Co substitution.
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