Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Magnetic Properties of Micron Sized Fe3O4 Crystals Synthesized by Hydrothermal Methods

수열합성을 이용하여 제작한 Fe3O4 결정입자의 자기적 특성

  • Lee, Ki-Bum (Department of Applied Physics, Hannam University) ;
  • Nam, Chunghee (Department of Applied Physics, Hannam University)
  • 이기범 (한남대학교 광전자물리학과) ;
  • 남충희 (한남대학교 광전자물리학과)
  • Received : 2019.11.16
  • Accepted : 2019.12.03
  • Published : 2019.12.28
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Abstract

Iron oxides currently attract considerable attention due to their potential applications in the fields of lithiumion batteries, bio-medical sensors, and hyperthermia therapy materials. Magnetite (Fe3O4) is a particularly interesting research target due to its low cost, good biocompatibility, outstanding stability in physiological conditions. Hydrothermal synthesis is one of several liquid-phase synthesis methods with water or an aqueous solution under high pressure and high temperature. This paper reports the growth of magnetic Fe3O4 particles from iron powder (spherical, <10 ㎛) through an alkaline hydrothermal process under the following conditions: (1) Different KOH molar concentrations and (2) different synthesis time for each KOH molar concentrations. The optimal condition for the synthesis of Fe3O4 using Fe powders is hydrothermal oxidation with 6.25 M KOH for 48 h, resulting in 89.2 emu/g of saturation magnetization at room temperature. The structure and morphologies of the synthesized particles are characterized by X-ray diffraction (XRD, 2θ = 20°-80°) with Cu-kα radiation and field emission scanning electron microscopy (FE-SEM), respectively. The magnetic properties of magnetite samples are investigated using a vibrating sample magnetometer (VSM). The role of KOH in the formation of magnetite octahedron is observed.

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