Controlled synthesis of Mn{sub 3}O{sub 4} and MnCO{sub 3} in a solvothermal system
- School of Chemistry and Materials Science, Ludong University, Yantai 264025 (China)
Controlled synthesis of Mn{sub 3}O{sub 4} nanocrystals and MnCO{sub 3} aggregates was achieved by a facile solvothermal method using different divalent manganese source in the solvent of N,N-dimethylformamide (DMF) with/without the introduction of poly(vinylpyrrolidone) (PVP). PVP was used as a co-reducing reagent in the controlled formation of MnCO{sub 3} crystal. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and selected-area electron diffraction (SAED), Fourier transform infrared (FTIR) spectra, Raman spectrum and magnetic measurement. Higher process temperature and longer solvothermal time were favorable for the formation of MnCO{sub 3} single phase using MnCl{sub 2} as the manganese source. Mn{sub 3}O{sub 4} nanocrystals were prepared at a relatively lower temperature. MnCO{sub 3} aggregates consisted by small nanoparticles have a certain orientation, showing that the nanocrystals formed earlier through oriented aggregation. The size of Mn{sub 3}O{sub 4} nanocrystals was 22.5 {+-} 7.3 nm and 7.3 {+-} 1.4 nm prepared using MnCl{sub 2} and Mn(CH{sub 3}COO){sub 2}, respectively, at 160 deg. C for 24 h. Raman spectra showed size-dependent characteristics. Smaller Mn{sub 3}O{sub 4} nanoparticle resulted in a red-shift in Raman spectra. Magnetic property of the prepared Mn{sub 3}O{sub 4} nanoparticle was influenced by the size distribution and crystallinity.
- OSTI ID:
- 22029834
- Journal Information:
- Materials Research Bulletin, Vol. 44, Issue 8; Other Information: Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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