Unconventional Behavior of Na₂O in MgO-V₂O₅ Glasses in Comparison to Silicate Glasses

Abstract

The composition of 75V 2 O 5 -(25 − x)MgO-(x)Na 2 O with x = 0, 1.5, 3.0, 4.5, 6.0, 9.0, and 12 is synthesized by the melt quench technique. The prepared samples were characterized by the X-ray diffraction (XRD) method. XRD pattern of 75V 2 O 5 -25MgO confirmed the glass formation. The addition of Na 2 O converted glass into a glass ceramic/ceramics. The density shows no trend with the Na 2 O content in the glass compositions. Differential thermal analysis confirmed the glassy nature of the x = 0 sample. For all samples, the conductivity variation as a function of the temperature follows an Arrhenius relationship. The highest conductivity is found for the x = 12 sample, i.e., 10 −2 S/cm at 250 °C with better thermal stability. The developed samples can find applications as cathode materials in Mg-or Nabased batteries due to good conductivity with better thermal and structural stability.