Effect of Fe2O3 substitution for Al2O3 on the structure and properties of Na-Fe-Al-P-O-N oxynitride glasses

Abstract

Na-Fe-Al-P-O-N glasses have been successfully prepared by melting batches at 1050–1150 °C under N2 atmosphere. The amorphous nature of the Na-Fe-Al-P-O-N glasses was verified by an X-ray diffractometer. The structural changes of the glasses were investigated by Raman and infrared spectroscopy. As Fe2O3 increases, the structural change is attributed to the significant effect of Fe3+ ions on the phosphate network in the glasses. The thermal behaviors of the glasses were studied by DSC methods. As Fe2O3 gradually replaces Al2O3, the crystallization tendency of these glasses increases. The chemical durability of the glasses is assessed by measuring the dissolution rate. As the Fe2O3 content increases, the overall trend of the chemical durability is first lowered and then increased. The conductivity of the glasses varied greatly with the Fe2O3 content in the frequency range used. The activation energy (Eac) decreases from 59.8 to 45.7 kJ mol−1 with increasing Fe2O3 content.