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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Nepheline crystallization behavior in simulated high-level waste glasses
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Nepheline crystallization behavior in simulated high-level waste glasses

机译：模拟高水平废眼镜中的尼触林结晶行为

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摘要

The U.S. Department of Energy immobilizes legacy nuclear high-level waste (HLW) in borosilicate glass. HLW glass with elevated Na2O and Al2O3 concentrations have a demonstrated propensity for precipitating nepheline (NaAlSiO4) during cooling, which adversely affects the waste form performance. Currently, nepheline is suppressed by controlling the HLW glass composition, but this can limit the waste loading and result in longer mission life and cost. Correlation between composition and thermal history experienced during processing with time-temperature relationships that enable nepheline crystal growth would facilitate a more realistic prediction of nepheline crystallization in HLW glass and allow for a wider range of compositions to be accessed. In this work, crystallization behavior in simulated HLW glass was investigated to identify key attributes that lead to nepheline formation, with results indicating that the rate of diffusion for crystal growth may be controlled by glass structure connectivity.
机译：美国能源部在硼硅酸盐玻璃中固定遗产核高水平废物（HLW）。 HLW玻璃具有升高的Na 2 O和Al 2 O 3浓度，在冷却过程中具有沉淀尼触（NaAlsiO4）的倾向，这对废物形式的性能产生不利影响。目前，通过控制HLW玻璃组合物来抑制Nepheleel，但这可以限制废物负载并导致更长的任务生活和成本。在使Nephelinal晶体生长的时间温度关系中处理的成分和热历史之间的相关性将促进HLW玻璃中肾盂结晶的更现实预测，并允许进入更广泛的组合物。在这项工作中，研究了模拟HLW玻璃中的结晶行为，以鉴定导致Nepheline地层的关键属性，结果表明晶体生长的扩散速率可以通过玻璃结构连接来控制。

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