Structural and thermal properties of Na2S-P2S5 glass and glass ceramics

In the present study, xNa2S + (100 − x)P2S5 35 ≤ x ≤ 60 glasses and glass ceramics have been prepared by melt quenching technique. The glasses and glass ceramics have been characterized using XRD, Raman and FT-IR spectroscopy. All glass samples show phase separation. For x = 60, two crystalline phases Na3PSO3 and Na4P2O7 are observed. The H2S generation and stability of Na2S-P2S5 glasses after exposure to air at different time intervals are investigated using gas chromatography. The amount of H2S generated from Na2S-P2S5 glasses exposed to air is found to be dependent on the glass compositions. Raman spectroscopy demonstrates that the 45Na2S-55P2S5 and 55Na2S-45P2S5 (mol %) glasses exhibit minor structural changes as compared to other compositions.