Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Isomorphous Substitution of Fe in Sodalite and Its Electric Characterization

  • Kim, Chy-Hyung (Department of Chemistry and Physics and Optical Engineering, Chongju University) ;
  • Jung, Chi-Sup (Department of Chemistry and Physics and Optical Engineering, Chongju University)
  • Published : 1993.04.20
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Abstract

Experiment on isomorphous substitution of Al by Fe in sodalite framework was carried out using dry way method at 800-900$^{\circ}$C in nitrogen atmosphere. The substitution of Fe was possible up to 25 mole% with some deviation of symmetry in sodalite cage. The cubic unit cell parameter increased with increasing Fe content. It showed ionic semiconducting property, especially the highest conductivity and the lowest activation energy in 10 mole% Fe-substituted sodalite which could behave as a superionic conductor at above 400$^{\circ}$C. When more Fe was introduced into sodalite the electronic conductivity was improved at high temperature. But the relative electronic contribution was found to be lower compared with ionic contribution at high temperature. In infrared spectra some major absorption bands of sodalite shifted to lower wave numbers due to heavier Fe atoms substitution in Al lattice sites.

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References

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