${\mathrm{\text{La}}}_{0.8}{\mathrm{\text{Sr}}}_{0.2}{\mathrm{\text{Fe}}}_{1-x}{\mathrm{\text{Mn}}}_x{\mathrm{\text{O}}}_3$ ($x=0.0$, 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 ${}^{57}$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.

${\mathrm{\text{拉}}}_{0。8}{\mathrm{\text{锶}}}_{0。2}{\mathrm{\text{铁}}}_{1-X}{\mathrm{\text{锰}}}_X{\mathrm{\text{氧}}}_3$（$X=0。0$采用溶胶-凝胶法制备了 、0.1、0.3 和 0.5）系列样品，并通过粉末 X 射线衍射仪（XRD）、扫描电子显微镜（SEM）、能谱仪（EDS）和穆斯堡尔谱仪进行了表征。研究了Mn掺杂对La-Sr铁氧体微观结构、形貌和电子结构的影响。XRD结果表明，所有样品均为单相，具有Pbnm空间群的斜方结构。通过SEM和EDS对样品的表面形貌和化学元素组成进行了分析，实验值与预期值一致。样品经过测试${}^{57}$室温下 Fe 穆斯堡尔谱，结果表明，随着 Mn 离子掺杂比例的增加，双峰比例逐渐增加，而在室温下，双峰比例逐渐增加。$X=0。5$，所有六重奏都消失了，只有双重存在。根据分析可以看出，所制备的系列样品经历了从反铁磁性到顺磁性的转变。