We have studied the water durability of ZrO 2 containing FeOFe 2 O 3 P 2 O 5 glasses for the immobilization of nuclear waste including Zr isotope. ZrP 2 O 7 crystals with 12 micrometer in diameter were precipitated in the glass matrix incorporated with ²1 mol % ZrO 2. The molecular structure of phosphate network including ZrP 2 O 7 precipitates was analyzed by micro-Raman spectroscopy. Formations of Q 1 and Q 0 phosphate units contributing to better water durability are ascribed to preferential precipitation of ZrP 2 O 7 crystals with Q 1 units and the compensation of phosphate component in residual glass matrix.
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