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Synthesis of Single Crystalline Analcime and Its Single-crystal Structure, |Na<sub>0.94</sub>(H<sub>2</sub>O)|[Si<sub>2.06</sub>Al<sub>0.94</sub>O<sub>6</sub>]-ANA: Determination of Cation Sites, Water Positions, and Si/Al Ratios
Synthesis of Single Crystalline Analcime and Its Single-crystal Structure, |Na0.94(H2O)|[Si2.06Al0.94O6]-ANA: Determination of Cation Sites, Water Positions, and Si/Al Ratios
Journal of the Korean Chemical Society. 2011. Aug, 55(4): 570-574
Copyright © 2011, The Korean Chemical Society
  • Received : February 23, 2011
  • Accepted : May 24, 2011
  • Published : August 20, 2011
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성만 서
정민 서
성운 고
우택 임

Abstract
Large colorless single crystals of analcime with diameters up to 0.20 mm have been synthesized from gels with the composition of 3.00SiO 2 : 1.50NaAlO 2 : 8.02NaOH : 454H 2 O : 5.00TEA. The fully Na + -exchanged analcime have been prepared with aqueous 0.1 M NaCl (pH adjusted from 6 to 11 by dropwise addition of NaOH). The single-crystal structure of hydrated |Na 0.94 (H 2 O)|[Si 2.06 Al 0.94 O 6 ]-ANA per unit cell, a =13.703(3) Å, has been determined by single-crystal X-ray diffraction technique in the orthorhombic space group Ibca at 294 K. The structure was refined using all intenties to the final error indices (using only the 1,446 reflections for which Fo > 4σ( Fo )) R 1 / wR 2 =0.054/0.143. About 15 Na + ions are located at three nonequivalent positions and octahedrally coordinated. The chemical composition is Na 0.94 (H 2 O)Si 2.06 Al 0.94 O 6 . The Si/Al ratio of synthetic analcime is 2.19 determined by the occupations of cations, 14.79, in the single-crystal determination work.
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Acknowledgements
We gratefully acknowledge the support of beamline 4A MXW at the Pohang Light Source, Korea, for their diffraction and computing facilities. This work was supported by a grant (contract number: 2010-0119) from the Research Fund at Andong National University.
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