Mössbauer Investigation of Mn-Doped La–Sr Ferrite Synthesized by the Sol–Gel Method.

La 0. 8 Sr 0. 2 Fe 1 − x Mn x O 3 (x = 0. 0 , 0.1, 0.3 and 0.5) series samples were prepared by sol–gel method and characterized by powder X-ray diffractometer (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and Mössbauer spectroscopy. The effects of Mn doping on the microstructure, morphology and electronic structure of La–Sr ferrite were investigated. The XRD results show that all samples are single phase and have orthorhombic structures with Pbnm space group. The surface morphology and composition of chemical elements of the samples were analyzed by SEM and EDS, and the experimental values were consistent with the expected values. The sample was tested by 5 7 Fe Mössbauer spectroscopy at room temperature, and the results showed that the percentage of doublet increased gradually with the increase of Mn ion doping ratio, and at x = 0. 5 , all the sextet disappeared and only the doublet existed. According to the analysis, it can be seen that the prepared series of samples underwent a transition from antiferromagnetic to paramagnetic. La_0.8Sr_0.2Fe_1–xMn_xO₃ (x = 0.0, 0.1, 0.3 and 0.5) series samples were prepared by sol–gel method, and the effect of Mn³⁺ doping on the structural morphology and electronic structure of La–Sr ferrite was studied. Mössbauer spectrum test results show that with the increase in the doping ratio of Mn³⁺, the percentage of double peaks gradually increases. When x = 0.5, all the sextet disappeared and only the doublet existed. The analysis shows that Mn³⁺ doping led to the transition of La–Sr ferrite from antiferromagnetic to paramagnetic. [ABSTRACT FROM AUTHOR]