Preparation of Li-ferrite Powders by Hyrtothermal Method

수열합성법에 의한 Li-ferrite 분말 제조

  • Lee, Jong-Hyeon (Rapidly Solidified Materials Research Center, Chungnam National University) ;
  • Kang, Yong (Dept. of Chemical Eng., Chungnam National University) ;
  • Won, Chang-Whan (Rapidly Solidified Materials Research Center, Chungnam National University) ;
  • Chun, Byong-Sun (Rapidly Solidified Materials Research Center, Chungnam National University)
  • 이종현 (충남대학교 급속응고신소재연구소) ;
  • 강용 (충남대학교 화학공학과) ;
  • 원창환 (충남대학교 급속응고신소재연구소) ;
  • 천병선 (충남대학교 급속응고신소재연구소)
  • Published : 1995.05.01

Abstract

Li-ferrite powders were prepared from mixture of Fe and Li salts using a hydrothermal method. Their crystal structure, microstructure and magnetic property were investigated with X-ray diffraction analysis, chemical analysis, SEM, and VSM. In the case of using FeCl3 as a precursor, Li-ferrite powders were synthesized. However, Fe3O4 was formed when the precursor was a divalented Fe2SO4 or FeCl2. The precipitation rate of Li-ferrite was increased as the reaction temperature increased. The optimum conditions of synthesis were the mole ratio of Fe+++/Li+=2, pH 13, the reaction temperature of 25$0^{\circ}C$ and the reaction time of 120min. With this condition, the spherical particles with good dispersion were obtained with average particle size of 0.4${\mu}{\textrm}{m}$ and saturation magnetization of 65 emu/g.

Keywords

Li-ferrite;Hydrothermal method

References

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