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Effect of ZrO$$_{2}$$ addition on water durability of FeO-Fe$$_{2}$$O$$_{3}$$-P$$_{2}$$O$$_{5}$$ glasses

Kitamura, Naoto*; Nomura, Akira*; Saito, Akira*; Kobayashi, Hidekazu ; Amamoto, Ippei; Takebe, Hiromichi*

We studied compositional dependence of water durability of Zr(IV) containing FeO-Fe$$_{2}$$O$$_{3}$$-P$$_{2}$$O$$_{5}$$ glasses systems, which can apply to immobilize nuclear waste of Zr isotope. Stabilized film with interference fringe on the surface improves better water durability after immersion tests for BaO and ZrO$$_{2}$$ coexisting glasses without fracture. On the other hand, microcrystalline ZrP$$_{2}$$O$$_{7}$$ was detected in the glass matrix when more than 1 mol% of ZrO$$_{2}$$ incorporated. The effect of impregnated ZrP$$_{2}$$O$$_{7}$$ crystal on the structure was discussed based on the phosphate structure analyzed by Raman spectra. Formation of Q$$^{1}$$ and Q$$^{0}$$ units, which contribute to water durability in the glass, are due to preferential precipitation of ZrP$$_{2}$$O$$_{7}$$ crystal.

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Category:Materials Science, Ceramics

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