查看文章

The effect of Al₂O₃ content on electrical conductivity and glass stability against crystallization in the system KH₂PO₄–Al₂O₃–P₂O₅ was investigated using Raman, IR, and impedance spectroscopies.

DSC observations were carried out on glasses from a series of KH₂PO₄/(1 − x) P₂O₅/x Al₂O₃, with x = 0, 0.5, 0.1, 0.2 and 0.3 mol, to determine the relative glass stability. The DSC observations indicate that from x = 0.1 the glasses become more stable. For this composition (x = 0.1) the conductivity, which was obtained by AC-impedance spectroscopic studies, was 7.0 × 10^− 6 S·cm^− 1 at room temperature.

Spectroscopic investigations reveal the depolymerization of the phosphate glass network by systematic conversion of Q² structural units into Q¹ and finally into Q⁰ structural units. Even though Q² to Q¹ conversion is taking place due to breaking of P-O-P linkages, formation of P-O-Al linkages provide cross linking …