Investigation of xV(2)O(5)-B2O3 and xV(2)O(5)-B2O3-yNa(2)O Glasses by B-11 MAS NMR

B-11 MAS NMR spectra of binary glass system xV(2)O(5)-B2O3 and ternary glass system xV(2)O(5)-B2O3-yNa(2)O (x = V2O5 mol%/B2O3 mol%, y = Na2O mol%/B2O3 mol%) were acquired. BO3 units are dominant components in the spectra of xV(2)O(5)-B2O3 glass systems while both BO3 and BO4 units appear in comparable amounts in the spectra of xV(2)O(5)-B2O3-yNa(2)O glass systems. More BO3 units were monitored for higher V2O5 contents while more BO4 units for higher Na2O contents. Quadrupole parameters such as e(2)qQ and ? obtained from spectral simulation indicate that e(2)qQ has a maximum value at x = y = 1 and eta decreases and increases as x or y grows, respectively. Our results suggest that V2O5 and Na2O play opposite roles in the ternary glasses.