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Title: Synthesis, crystal structure and characterization of Na<sub>2.02</sub>Ag<sub>5.98</sub>[GaSiO<sub>4</sub>]<sub>6</sub>(NO<sub>2</sub>)<sub>2 </sub>and Na<sub>3.12</sub>K<sub>4.88</sub>[GaSiO<sub>4</sub>]<sub>6</sub>(NO<sub>2</sub>)<sub>2</sub> sodalites
Authors: Borhade, A V
Wakchaure, S G
Keywords: Gallosilicate
Nitrite derivatives
Reitveld refinement
Issue Date: Aug-2011
Publisher: NISCAIR-CSIR, India
Abstract: Partially exchanged silver and potassium derivatives of Na<sub>8</sub>[GaSiO<sub>4</sub>]<sub>6</sub>(NO<sub>2</sub>)<sub>2 </sub>sodalite, Na<sub>2.02</sub>Ag<sub>5.98</sub>[GaSiO<sub>4</sub>]<sub>6</sub>(NO<sub>2</sub>)<sub>2 </sub>and Na<sub>3.12</sub>K<sub>4.88</sub>[GaSiO<sub>4</sub>]<sub>6</sub>(NO<sub>2</sub>)<sub>2, </sub>have been studied. The nitrite sodalite of the composition, Na<sub>8</sub>[GaSiO<sub>4</sub>]<sub>6</sub>(NO<sub>2</sub>)<sub>2 </sub>was prepared at low temperature by hydrothermal technique and the derivatives Na<sub>2.02</sub>Ag<sub>5.98</sub>[GaSiO<sub>4</sub>]<sub>6</sub>(NO<sub>2</sub>)<sub>2 </sub>and Na<sub>3.12</sub>K<sub>4.88</sub>[GaSiO<sub>4</sub>]<sub>6</sub>(NO<sub>2</sub>)<sub>2, </sub>were obtained by cation exchange method at 373 K. These products crystallize with the cubic sodalite structure in the space group P43n and profile refinement of powder X-ray data has been completed. The products obtained were studied by different investigative techniques like IR spectroscopy, X-ray powder diffraction, UV-DRS and SEM. FTIR study shows shift in absorption frequency for the exchange of silver and potassium derivatives. The unit cell parameters (<i>a</i>) are found to be 8.9328, 8.9838 and 9.0409 Å for silver, sodium and potassium sodalites, respectively, while the bond distances and bond angles are modified considerably. UV-DRS study shows shift in bands and change in band gap energy of these sodalite derivatives. SEM shows surface morphology of these sodalites.
Description: 563-567
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.49(08) [August 2011]

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