Abstract
Iron redox equilibrium, structure and properties were investigated for the 10ZnO–30Fe 2O 3–60P 2O 5 (mol%) glasses melted at different temperatures. The structure and valence states of the iron ions in these glasses were investigated using Mössbauer spectroscopy, Raman spectroscopy and differential thermal analysis. Mössbauer spectroscopy indicated that the concentration of Fe 2+ ions increased in the 10ZnO–30Fe 2O 3–60P 2O 5 (mol%) glass with increasing melting temperature. The Fe 2+/(Fe 2+ + Fe 3+) ratio increased from 0.18 to 0.38 as the melting temperature increased from 1100 to 1300 °C. The measured isomer shifts showed that both Fe 2+ and Fe 3+ ions are in octahedral coordination. It was shown that the dc conductivity strongly depended on Fe 2+/(Fe 2+ + Fe 3+) ratio in glasses. The dc conductivity increases with the increasing Fe 2+ ion content in these glasses. The conductivity arises from the polaron hopping between Fe 2+ and Fe 3+ ions which suggests that the conduction is electronic in nature in zinc iron phosphate glasses.
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