Abstract—

The Y_0.95Gd_0.05PO₄ phosphate with the xenotime structure has been synthesized in powder form and as ceramics. Ceramics with a relative density of ~99% have been produced by spark plasma sintering. The sintering temperature was 1140°C and the sintering time was ~18 min, without isothermal holding. We have assessed the radiation resistance of the ceramics under irradiation with ¹³²Xe²⁶⁺ ions and investigated the restoration of the obtained metamict phase to a crystalline one via high-temperature heat treatment. No complete amorphization of the samples has been reached at the fluences used in this study. The calculated critical fluence is (9.2 ± 0.1) × 10¹⁴ cm^–2, and the calculated latent track radius is ~2.8 nm. Hydrolytic tests have shown that the phosphate under study is stable in water under dynamic conditions. The observed Y and Gd leaching rates were R_i = 1.68 × 10^–6 and 1.5 × 10^–7 g/(cm² day), respectively.

中文翻译：

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磷钇矿结构Y0.95Gd0.05PO4基陶瓷的耐辐射性和水解稳定性

摘要-

具有磷钇矿结构的 Y _0.95 Gd _0.05 PO ₄磷酸盐已以粉末形式和陶瓷合成。相对密度约为 99% 的陶瓷是通过放电等离子烧结生产的。烧结温度为 1140°C，烧结时间为~18 分钟，没有等温保温。我们评估了陶瓷在¹³² Xe ²⁶⁺离子辐照下的耐辐射性，并研究了通过高温热处理将获得的 metamict 相恢复为结晶相。在本研究中使用的通量未达到样品的完全非晶化。计算出的临界通量为 (9.2 ± 0.1) × 10 ¹⁴ cm ^–2，计算出的潜在轨道半径为~2.8 nm。水解试验表明，所研究的磷酸盐在动态条件下在水中是稳定的。观察到的 Y 和 Gd 浸出率分别为R _i = 1.68 × 10 ^–6和 1.5 × 10 ^–7 g/(cm ² day)。