DOI QR코드

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Effects of Ga Substitution on Crystallographic and Magnetic Properties of Co Ferrites

  • Chae, Kwang Pyo (Department of Nano Science and Mechanical Engineering, Nanotechnology Research Center, Konkuk University) ;
  • Choi, Won-Ok (Department of Nano Science and Mechanical Engineering, Nanotechnology Research Center, Konkuk University) ;
  • Kang, Byung-Sub (Department of Nano Science and Mechanical Engineering, Nanotechnology Research Center, Konkuk University) ;
  • Lee, Young Bae (Department of Physics, Hanzhong University)
  • 투고 : 2014.11.11
  • 심사 : 2014.12.30
  • 발행 : 2015.03.31

초록

The crystallographic and magnetic properties of gallium-substituted cobalt ferrite ($CoGa_xFe_{2-x}O_4$) were investigated. The new material was synthesized using conventional ceramic methods, with gallium substituted for ferrite in the range of x = 0.0 to 1.0, in steps of 0.2. X-ray diffraction and M$\ddot{o}$ssbauer spectroscopy were used to confirm the presence of crystallized particles in the $CoGa_xFe_{2-x}O_4$ ferrite powders. All of the samples exhibited a single phase with a spinel structure, and the lattice parameters decreased as the gallium content increased. The particle size of the samples also decreased as gallium increased. For $x{\leq}0.4$, the M$\ddot{o}$ssbauer spectra of $CoGa_xFe_{2-x}O_4$ could be fitted with two Zeeman sextets, which are the typical spinel ferrite spectra of $Fe^{3+}$ with A- and B-sites. However, for $x{\geq}0.6$, the M$\ddot{o}$ssbauer spectra could be fitted with two Zeeman sextets and one doublet. The variation in the M$\ddot{o}$ssbauer parameters and the absorption area ratio indicated a cation distribution of $(Co_{0.2-0.2x}Ga_xFe_{0.8-0.6x})[Co_{0.8+0.2x}Fe_{1.2-0.4x}]O_4$, and the magnetic behavior of the samples suggested that the increase in gallium content led to a decrease in the saturation magnetization and in the coercivity.

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참고문헌

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