Synthesis, crystal structure and characterization of Nasub2.02/subAgsub5.98/sub[GaSiOsub4/sub]sub6/sub(NOsub2/sub)sub2 /suband Nasub3.12/subKsub4.88/sub[GaSiOsub4/sub]sub6/sub(NOsub2/sub)sub2/sub sodalites

摘要

Partially exchanged silver and potassium derivatives of Nasub8/sub[GaSiOsub4/sub]sub6/sub(NOsub2/sub)sub2 /subsodalite, Nasub2.02/subAgsub5.98/sub[GaSiOsub4/sub]sub6/sub(NOsub2/sub)sub2 /suband Nasub3.12/subKsub4.88/sub[GaSiOsub4/sub]sub6/sub(NOsub2/sub)sub2, /subhave been studied. The nitrite sodalite of the composition, Nasub8/sub[GaSiOsub4/sub]sub6/sub(NOsub2/sub)sub2 /subwas prepared at low temperature by hydrothermal technique and the derivatives Nasub2.02/subAgsub5.98/sub[GaSiOsub4/sub]sub6/sub(NOsub2/sub)sub2 /suband Nasub3.12/subKsub4.88/sub[GaSiOsub4/sub]sub6/sub(NOsub2/sub)sub2, /subwere 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 (ia/i) are found to be 8.9328, 8.9838 and 9.0409 ? 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.