57Fe Mössbauer study of Zn doped cobalt based (Co2Y) Y-type Ba0.5Sr1.5Co2Fe12O22 hexaferrites.

In the present work, polycrystalline Y-type Ba_0.5Sr_1.5Co_2−xZn_xFe₁₂O₂₂ (X = 0, 0.5, 1 & 2) hexa-ferrites prepared by the sol-gel auto combustion method are investigated by x-ray diffraction (XRD), ⁵⁷Fe Mössbauer spectroscopy (MS) and magnetization measurements. XRD data confirms the single-phase formation for x = 0 and 0.5; however, with further increase in Zn concentration secondary phases are observed. The in-field Mössbauer data measured at low temperature (5K) indicates that there is a re-distribution of Fe³⁺ ions in the studied samples, with the substituted Zn²⁺ preferentially going to 6C_IV, 6C_{IV ∗} sites. [ABSTRACT FROM AUTHOR]