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首页> 外文期刊>Crystal growth & design >Synthetic influences on neptunium incorporation in naturally occurring copper uranyl phosphates
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Synthetic influences on neptunium incorporation in naturally occurring copper uranyl phosphates

机译：对天然存在的铀酰磷酸铜中n掺入的合成影响

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摘要

Neptunium incorporation in the torbernite/meta-torbernite [Cu(UO _2)_2(PO_4)_2·nH_2O] system has been investigated in this study under both hydrothermal and slow diffusion conditions (at room temperature and 90 C) to examine the role synthetic conditions play on neptunium uptake by uranyl phases and whether hydrothermal incorporation studies feasibly model environmental incorporation. The hydrothermally prepared crystals contained approximately 19 ± 2 and 73 ± 3 times more neptunium on average than crystals grown during slow diffusion at room temperature and elevated temperature, respectively. UV-vis spectroscopy on the mother solution showed that, on average, 51.53(±0.04)% of the original neptunium(V) remains in solution following hydrothermal synthesis versus 37.24(±0.04)% following slow diffusion at room temperature and 73.62(±0.07)% at 90 C. Additionally, solid-state UV-vis-NIR indicated that the incorporated neptunium was predominantly present in the +6 oxidation state in the hydrothermal samples despite the fact that the initial oxidation state of neptunium in solution was +5 and no oxidizing species were present in the reactions. The oxidation state of neptunium in the slow diffusion samples was not able to be determined due to the low incorporation levels. These results suggest that neptunium(VI) may play a more significant role than previously expected in geological repositories.
机译：在水热和慢扩散条件下（在室温和90 C下）都研究了to铁矿/金属-菱锰矿[Cu（UO _2）_2（PO_4）_2·nH_2O]体系中的in掺入量，以研究合成中的作用条件影响铀基相对n的吸收，以及水热掺入研究是否可以模拟环境掺入。水热制备的晶体分别比在室温和高温下缓慢扩散过程中生长的晶体平均含有约19±2和73±3倍的ept。母液的紫外可见光谱显示，在水热合成后，溶液中平均保留了原始（（V）的51.53（±0.04）％，而在室温下缓慢扩散后为73.62（±），平均为37.24（±0.04）％。在90°C时为0.07）％。此外，固态UV-vis-NIR表明掺入的n在水热样品中主要以+6氧化态存在，尽管溶液中n的初始氧化态为+5反应中不存在氧化性物质。由于掺入水平低，无法确定慢扩散样品中of的氧化态。这些结果表明，（（VI）可能比地质储层中预期的作用更大。

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