Abstract
Using a sol–gel method, Perovskite-type manganese oxides La 0.7Sr 0.3MnO 3 nanoparticles with various grain sizes were prepared. A transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis were employed to identify the microstructure. A Rietveld refinement method was applied to determine crystallographic parameters. Results show that prepared-nanoparticles are single crystal, the edge length of the unit cell becomes longer and the angle between the edges becomes less deviated from 60° as the grain sizes decrease, and the crystal symmetry changes from rhombohedral to cubic as D ∼ 16 nm. The magnetic properties were investigated using a vibrating sample magnetometer, the magnetization is significantly lower than that of bulk sample.
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