Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Synthesis and Characterization of Rod-Shaped Ni-Zn Ferrite Particles

막대형 Ni-Zn 페라이트 입자의 합성 및 특성 평가

  • Received : 2017.12.12
  • Accepted : 2018.03.20
  • Published : 2018.07.01
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Abstract

The rod-shaped $Ni_{0.5}Zn_{0.5}Fe_2O_4$ particles were synthesized via a topotactic reaction, in which goethite (${\alpha}-FeOOH$) particles are the main constituents. The phases, microstructures and magnetic properties of these particles were studied using XRD, FE-SEM and VSM. The precursor solution consisted of $NiSO_4{\cdot}xH_2O$, $ZnSO_4{\cdot}xH_2O$, goethite and D.I. water werereacted at four different temperatures (50, 70, 90, $100^{\circ}C$) to generate four differently precipitated particles respectively. During the co-precipitation reaction, the pH of the solution was maintained at 8.0 using NaOH. The particles co-precipitated and calcined at a temperature of $700^{\circ}C$, exhibited a rod-shape similar to its original goethite, which means that the shape of Ni-Zn ferrite particles can be topotactically controlled by the goethite. The particles synthesized at 70 and $90^{\circ}C$ have a saturation magnetization of 29 and 35 emu/g respectively; representing better values than the ones synthesized at the 50 and $100^{\circ}C$, in which some second phases such as $Fe_2O_3$ were observed.

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References

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