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Synthesis of magnetoresistive La0.7Sr0.3MnO3 nanoparticles by an improved chemical coprecipitation method |
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| Authors: | Z.F. Zi Y.P. Sun X.B. Zhu J.M. Dai |
| Affiliation: | a Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, PR China b Department of Physics and Electronic Engineering, Hefei Teachers College, Hefei 230061, PR China c High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, PR China |
| Abstract: | La0.7Sr0.3MnO3 nanoparticles were prepared by a simple chemical coprecipitation route. Structural, magnetoresistance (MR), and magnetic properties were investigated. Rietveld refinement of X-ray powder diffraction result shows that the sample is single-phase with the space group of R3¯C. The result of field-emission scanning electronic microscopy shows that most of the grain sizes are distributed from 50 to 200 nm. The composition determined by energy-dispersive spectroscopy is the stoichiometry of La0.7Sr0.3MnO3. The ferromagnetic to paramagnetic transition is sharp with Curie temperature TC=367 K, which further confirms that the sample is single-phase. The steep change in MR at low fields is attributed to the alignment of the magnetization, while the high-field MR is due to the grain boundary effect. |
| Keywords: | 75.50.Dd 75.47.Gk 75.47.Lx |
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