Abstract
Phosphate glasses have been studied extensively for their potential applications as disposal of nuclear waste. Addition of iron oxide to phosphate glasses has a significant effect on the structure and properties of these glasses. Differential thermal analysis, x-ray diffraction analysis and Raman spectroscopy have been used in the investigation of structural changes in the phosphate network and crystalline products of xFe 2 O 3 .(100-x)P 2 O 5 (15<x<50) glasses. The addition of Fe 2 O 3 in the phosphate glass results in the systematic changes from chain-like phosphate structure present in metaphosphate to the orthophosphate structure. With increasing iron content, there is a corresponding increase in the concentration of iron(III) ions in the glass and a decrease of the number of P-O-P bonds since these bonds are replaced by an increasing number of Fe-O-P bonds. The results of the crystallization process suggest that the glassy and its crystalline compositions both have the same basic phosphate structure.
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