Oxyapatite[Ca₂Nd₈(SiO₄)₆O₂] glass-ceramics have been suggested as wasteforms for the immobilisation of rare-earth radioactive nuclides because of their high waste-loading capability and good chemical durability. In particular, a partitioning effect is predicted to contribute to an enhancement of corrosion resistance in glass-ceramics compared with that of conjugate glasses of the same composition. Because rare-earths are inherently insoluble nuclides, detection of changes in corrosion behavior between glass-ceramics and conjugate glasses under normal conditions is not easy. In this study, therefore, we revealed the partitioning effect by exposing glass-ceramics and glasses to solution of pH 2, 7 and 10 at 90 °C for 20 d. In addition, we proposed the corrosion mechanism for oxyapatite glass-ceramics under various corrosion conditions. Especially, the glassy phase dissolved first, followed by the oxyapatite phase during pH 7 corrosion.

氧磷灰石[Ca ₂ Nd ₈ (SiO ₄ ) ₆ O ₂] 玻璃陶瓷已被建议作为固定稀土放射性核素的废物形式，因为它们具有高废物装载能力和良好的化学耐久性。特别是，与相同组成的共轭玻璃相比，预计分配效应有助于提高玻璃陶瓷的耐腐蚀性。由于稀土本质上是不溶性核素，因此在正常条件下检测微晶玻璃和共轭玻璃之间的腐蚀行为变化并不容易。因此，在本研究中，我们通过在 90 °C 下将微晶玻璃和玻璃暴露于 pH 2、7 和 10 的溶液中 20 天来揭示分配效应。此外，我们提出了氧磷灰石微晶玻璃在各种腐蚀条件下的腐蚀机理。尤其，