Stability, Durability and Crystallization of Iron Phosphate Glasses Melodie Schmitt, Liying Zhang, Mark E. Schlesinger and Richard K. Brow University of Missouri–Rolla NSF DMR 0502463 Glass Preparation and Characterization Phase Equilibria in Iron Phosphate Systems Prepared all ferric and ferrous phosphates. Characterized phase transitions by DTA and compositional changes along Fe 2 O 3 -P 2 O 5 liquidus surface by SEM- EDS. Determined enthalpy change for iron reduction in FePO 4 and Fe 3 PO 7 . Analyzed decomposition of Fe 3 PO 7 above 1100°C . Decomposition of FePO 7 quenched from 1200°C 20 30 40 50 60 c X R D in te n s ity 2 b 20 30 40 50 60 c X R D in te n s ity 2 b BSE image Fe map P map Fe 3 PO 7 Fe 2 O 3 +FePO 4 … Prepared glasses with range of O/P and Fe 2+ /Fe 3+ ratios. Crystallization behavior (by XRD, DTA) depends on redox conditions and particle size. ‘Glass stability’ parameters will be established in collaboration with Brazilian partners. Melt conditions affect glass structure.