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Abstract
Manganese (Mn)- and yttrium (Y)-substituted Sr-nanohexaferrites (MYSNHFs) of composition Sr1−xMnxFe12−xYxO19 (with 0.0 ≤ x ≤ 0.5) were prepared by citrate sol-gel autocombustion method. As-prepared MYSNHFs were characterized via diverse analytical techniques to determine the influence of Mn and Y cosubstitution on their microstructures and magnetic properties. 57Fe Mössbauer spectra of the MYSNHFs were used to evaluate the variation in the line width, isomer shift, quadrupole splitting, and hyperfine magnetic field values. It was shown that the dopant ions could preferentially occupy the 12k, 4f2, and 2b sites. Furthermore, the observed shift in the blocking temperatures of the studied MYSNHFs towards lower values with rising Mn2+ and Y3+ contents was attributed to the overall particles size reduction. Meanwhile, the AC susceptibility of the proposed MYSNHFs revealed that the magnetic interactions were weakened with the increase in dopant contents which was ascribed to the replacement of both Sr2+ and Fe3+ ions by the Mn2+ and Y3+ dopants.
Highlights
Nanotechnology science has created great excitement and expectations in the last few years
Concentrations, X-ray powder diffraction measurement (XRD) patterns displayed a minor peak assigned to α-Fe2 O3 phase
The value of a was almost reminiscent of the same values with the increase in dopant concentration
Summary
Nanotechnology science has created great excitement and expectations in the last few years. Sr–HF systems appear unique wherein their structures allow the favorable substitution of all Fe3+ ions by trivalent ions without secondary phase formation [10]. This in turn leads to the procession of varied magnetic traits depending on the nature of dopants’. Investigated the Mn substitution on the structure and magnetic properties of SrFe12 O19 nanoparticles prepared by sol-gel method. They showed that the crystal lattice constants did not change significantly with Mn substitution.
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