Structural, Optical and Electrical Properties of Aluminum Sodium Phosphate Glasses

By using the conventional melt quenching technique, the transparent glasses 55P₂O₅–35Na₂O–10Al₂O₃ (mol %) were prepared. Structural study has been investigated by using X-ray diffraction (XRD) and (EDAX) and it was found that the prepared samples were amorphous structure. Using the differential thermal analysis (DTA), the glass transition (T_g) and crystallization temperature (T_c) were determined, and the results show that the prepared glass samples exhibit thermal stability h '. Density, molar volume and oxygen packing density ensure that Al₂O₃ is incorporated in sodium phosphate glass. The dc, ac electrical conductivity and dielectric constants of the prepared glass samples have been investigated at frequency range (from 50 Hz to 5 MHz) and temperature T (from 303 to 443 K). The temperature dependence of the dc conductivity of prepared glasses follows the Arrhenius law. It was found that the values of activation energy ΔE_dc = 2.3 eV. The Cole–Cole plot was used to examine the conductivity mechanism for grain resistance. The results of the ac conductivity σ_ac and its frequency exponent (s) have been analyzed to determine the conduction mechanism. The exponent (s) has values between 0.42–0.8; consequently the (CBH) seems to be the most interesting model related to the obtained results.