Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Formation Mechanism of Aragonite by Substitute of Mg2+ Ions

  • Choi, Kyung-Sun (Korea Institute of Geoscience and Mineral Resources) ;
  • Park, Jin-Koo (Korea Institute of Geoscience and Mineral Resources) ;
  • Ahn, Ji-Whan (Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Hwan (School of Materials Science and Engineering, Seoul National University)
  • Published : 2004.12.01
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Abstract

Acicular type aragonite precipitated calcium carbonate was synthesized by carbonation reaction of $Ca(OH)_2$ slurry and $CO_2$ gas. As increasing the initial concentration of $Mg^{2+}$ ion, calcite crystal phase substantially decreased while that of aragonite crystal phase increased. According to XRD and EDS analysis, it was found that the addition of $MgCl_2$ induced the $Mg^{2+}$ ion to substitute in $Ca^{2+}$ ion site of calcite lattice then the unstabled calcite structure be resolved, consequently the growth of calcite structure is interrupted while the growth of aragonite structure is expedited.

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References

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