Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Growth of Oriented Thick Films of BaFe12O19 by Reactive Diffusion

  • Fisher, John G. (School of Materials Science and Engineering, Chonnam National University) ;
  • Vu, Hung (School of Materials Science and Engineering, Chonnam National University) ;
  • Farooq, Muhammad Umer (School of Materials Science and Engineering, Chonnam National University)
  • Received : 2014.04.30
  • Accepted : 2014.10.31
  • Published : 2014.12.31
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Abstract

Single crystal growth of $BaFe_{12}O_{19}$ by the solid state crystal growth method was attempted. Seed crystals of ${\alpha}-Fe_2O_3$ were pressed into pellets of $BaFe_{12}O_{19}$ + 2 wt% $BaCO_3$ and heat-treated at temperatures between $1150^{\circ}C$ and $1250^{\circ}C$ for up to 100 hours. Instead of single crystal growth taking place on the seed crystal, BaO diffused into the seed crystal and reacted with it to form a polycrystalline reaction layer of $BaFe_{12}O_{19}$. The microstructure, chemical composition and structure of the reaction layer were studied using scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), x-ray Diffraction (XRD) and micro-Raman scattering and confirmed to be that of $BaFe_{12}O_{19}$. XRD showed that the reaction layer shows a strong degree of orientation in the (h00)/(hk0) planes in the sample sintered at $1200^{\circ}C$. $BaFe_{12}O_{19}$ layers with a degree of orientation in the (hk0) planes could also be grown by heat-treating an ${\alpha}-Fe_2O_3$ seed crystal buried in $BaCO_3$ powder.

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