Investigation of $xV_2O_5-B_2O_3$ and $xV_2O_5-B_2O_3-yNa_3O$ Glasses by $^{11}B MAS$ NMR

  • Kim, Sun-ha (Analysis Reserch Division, Daegu Center, Korea Basic Science Insitute Daegu) ;
  • Han, Oc-Hee (Dept. of Physics, Myong Ji University Youngin) ;
  • Kang, Jae-Pil (Dept. of Physics, Myong Ji University Youngin)
  • 발행 : 2005.06.20

초록

$^{11}B MAS NMR$ spectra of binary glass system $xV_2O5-B_2O_3$ and ternary glass system $xV_2O5-B_2O_3-yNa_2O$ (x = $V_2O_5 mol%/$B_2O_3$ mol%, y = $Na_2O$ mol$/$B_2O_3$ mol%) were acquired. $BO_3$ units are dominant components in the spectra of $xV_2O_5-B_2O_3$glass systems while both $BO_3$ and $BO_4$ unit appear in comparable amounts in the spectra of $xV_2O_5-B_2O_3-yNa_2O$ glass systems. More $BO_3$ units were monitored for higher $V_2O_5$ contents while more $BO_4$ unit for higher $Na_2O$ contents. Quadrupole parameters such as $e^2qQ$ and $\eta$ obtained form spectral simulation indicate that $e^2qQ$ has a maximum value at x = y 1 and $\eta$ decreases and increases as x or y grows, respectively. Our results suggest that $V_2O_5$ and $Na_2O$ play opposite roles in the ternary glasses.

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