Stability, Durability and Crystallization of Iron Phosphate Glasses Mark E. Schlesinger, University of Missouri–Rolla, DMR 0502463 Glass Preparation and Characterization Phase Equilibria in Iron Phosphate Systems Decomposition of FePO 7 quenched from 1200°C. 20 30 40 50 60 c X R D intensity 2 b 20 30 40 50 60 c X R D intensity 2 b BSE image Fe map P map Fe 3 PO 7 Fe 2 O 3 +FePO 4 … Annealed thin–film glasses to produce glass compositions in Fe– P–O system (high-Fe, high-Fe 2+ /Fe 3+ ) not previously achieved. Demonstrated ability to change redox condition and crystallization behavior through post-melt heat treatments. Demonstrated effects of “aging” and particle size on crystallization behavior of iron phosphate glasses. UV-Vis spectra showing change in redox condition with heat treatment. Ten pure compounds synthesized successfully (ferric, ferrous and ferric–ferrous phosphates). Disproved existence of two compounds originally claimed in system. Revision of Fe 2 O 3 –P 2 O 5 phase diagram in progress (major changes from 1935 original). Building block toward thermodynamic characteri-zation of Fe -P–O system, prediction of phases crystallizing from glasses.