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Title: Microstructure and magnetic properties of MFe{sub 2}O{sub 4} (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method

Three kinds of spinel ferrite nanocrystals, MFe{sub 2}O{sub 4} (M = Co, Ni, and Mn), are synthesized using colloid mill and hydrothermal method. During the synthesis process, a rapid mixing and reduction of cations with sodium borohydride (NaBH{sub 4}) take place in a colloid mill then through a hydrothermal reaction, a slow oxidation and structural transformation of the spinel ferrite nanocrystals occur. The phase purity and crystal lattice parameters are estimated by X-ray diffraction studies. Scanning electron microscopy and transmission electron microscopy images show the morphology and particle size of the as-synthesized ferrite nanocrystals. Raman spectrum reveals active phonon modes at room temperature, and a shifting of the modes implies cation redistribution in the tetrahedral and octahedral sites. Magnetic measurements show that all the obtained samples exhibit higher saturation magnetization (M{sub s}). Meanwhile, experiments demonstrate that the hydrothermal reaction time has significant effects on microstructure, morphologies, and magnetic properties of the as-synthesized ferrite nanocrystals.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [5]
  1. State Key Laboratory of Chemical Resource Engineering and School of Science, Beijing University of Chemical Technology, Beijing 100029 (China)
  2. (China)
  3. State Key Laboratory of Organic–Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029 (China)
  4. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022 (China)
  5. Department of Physics, University of Texas at Arlington, Arlington, Texas 76019 (United States)
Publication Date:
OSTI Identifier:
22405046
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CATIONS; COBALT COMPOUNDS; CRYSTAL LATTICES; FERRITES; HYDROTHERMAL SYNTHESIS; MAGNETIC PROPERTIES; MAGNETIZATION; MANGANESE COMPOUNDS; MICROSTRUCTURE; NANOSTRUCTURES; OXIDATION; PARTICLE SIZE; PHASE TRANSFORMATIONS; PHONONS; RAMAN SPECTRA; SCANNING ELECTRON MICROSCOPY; SPINELS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION