Structural magnetic and Mossbauer study of 57Fe doped La2/3Ca1/3Mn1-xFexO3 (0≥x≥0.1) manganites

3rd International Meeting for Researchers in Materials and Plasma Technology; 1st Symposium on Nanoscience and Nanotechnology

物理学;材料科学

Sánchez, L.C.^1 ; Durango, D.^1 ; Arnache, O.^2

Universidad de Córdoba, Montería, Colombia^1

Universidad de Antioquia, Medellín, Colombia^2

关键词: Coercivity field;    Grain size distribution;    Hyperfine parameters;    Mossbauer spectra;    Octahedral coordination;    Paramagnetic state;    Solid state reaction method;    Structural and magnetic properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/687/1/012096/pdf
DOI  :  10.1088/1742-6596/687/1/012096

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

We have studied the effect of57Fe substitution on structural and magnetic properties of La2/3Ca1/3Mn1-xFexO3(LCMFO; x=0, 5 and 10%) manganites. The powders were prepared by the solid state reaction method, and the final products were characterized by X-Ray Diffraction (XRD), Mössbauer Spectrometry and Magnetic Measurements. Only one single phase corresponding to the manganite phase was detected without the presence of impurities or iron phases. The hyperfine parameters of Mossbauer spectra (MS), taken at different temperatures for the doped samples, reveal the only presence of Fe3+ions in octahedral coordination. At low temperatures, the MS spectra were fitted with a model of three components associated to three magnetic phases of iron (ferromagnetic and paramagnetic states). These ordered and not ordered magnetic phases are related to the effects of grain size distribution in LCMFO samples. Finally, significant changes were observed in the saturation magnetization, Curie temperature and coercivity field with increasing of iron doping level.