ABSTRACT

In this report, SrFeO_3-δ nanoparticle perovskite sample was prepared by the co-precipitation method. Rietveld refinement of the X-ray diffraction (XRD) data of SrFeO_3-δ sample showed that it has a cubic phase (space group: Pm3 m). The morphology and average size (11.15 nm) of the SrFeO_3-δ nanoparticle samples were characterised by the high-resolution transmission electron microscope (HRTEM). Mössbauer spectroscopy and X-ray photoelectron spectroscopy (XPS) results showed that the iron exists in different oxidation states. The SrFeO_3-δ nanoparticle sample exhibits a small energy band gap in the visible region. The ferroelectric nature in SrFeO_3-δ nanoparticle sample has been deduced from the dielectric measurement which is confirmed by differential scanning calorimetric (DSC) study. The magnetic order in SrFeO_3-δ nanoparticle sample has been deduced from the magnetic measurement which confirmed by Mössbauer spectroscopic study. Based on the obtained results, we concluded the presence of multiferroic nature in SrFeO_3-δ nanoparticle sample.

抽象的

在此报告中，通过共沉淀法制备了SrFeO3 _-δ纳米钙钛矿样品。SrFeO3 _-δ样品的X射线衍射（XRD）数据的Rietveld精炼显示，它具有立方相（空间群：Pm3 m）。用高分辨率透射电子显微镜（HRTEM）表征了SrFeO3 _-δ纳米颗粒样品的形貌和平均粒径（11.15 nm ）。Mössbauer光谱和X射线光电子能谱（XPS）结果表明，铁以不同的氧化态存在。SrFeO3 _-δ纳米颗粒样品在可见光区域显示出小的能带隙。SrFeO3 _-δ中的铁电性质从介电测量中推导出纳米颗粒样品，这已通过差示扫描量热法（DSC）研究得到证实。由Mössbauer光谱研究证实的磁性测量推导了SrFeO3 _-δ纳米颗粒样品中的磁性顺序。根据获得的结果，我们得出结论，SrFeO3 _-δ纳米颗粒样品中存在多铁性。