2018 Volume 126 Issue 11 Pages 948-951
We have studied the water durability of ZrO2 containing FeO–Fe2O3–P2O5 glasses for the immobilization of nuclear waste including Zr isotope. ZrP2O7 crystals with 1–2 micrometer in diameter were precipitated in the glass matrix incorporated with ≥1 mol % ZrO2. The molecular structure of phosphate network including ZrP2O7 precipitates was analyzed by micro-Raman spectroscopy. Formations of Q1 and Q0 phosphate units contributing to better water durability are ascribed to preferential precipitation of ZrP2O7 crystals with Q1 units and the compensation of phosphate component in residual glass matrix.