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

• Published in: Journal of physical chemistry. C 2023-08, Vol.127 (33), p.16278-16287
• Main Authors: Dua, Vimi, Choudhury, Sambit, Mahatha, Sanjoy Kr, Singh, Kulvir
• Format: Article
• Language: English
• Subjects: C: Energy Conversion and Storage
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/acs.jpcc.3c02757

The composition of 75V2O5-(25 – x)­MgO-(x)­Na2O 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 75V2O5-25MgO confirmed the glass formation. The addition of Na2O converted glass into a glass ceramic/ceramics. The density shows no trend with the Na2O 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 Na-based batteries due to good conductivity with better thermal and structural stability.