Nepheline crystallization behavior in simulated high-level waste glasses
| Autor: | Devon L. McClane, Jake W. Amoroso, Kevin M. Fox, Albert A. Kruger |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Glass structure Materials science Borosilicate glass Metallurgy Crystal growth 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials High-level waste law.invention chemistry.chemical_compound Differential scanning calorimetry chemistry law Nepheline 0103 physical sciences Materials Chemistry Ceramics and Composites Crystallization 0210 nano-technology |
| Zdroj: | Journal of Non-Crystalline Solids. 505:215-224 |
| ISSN: | 0022-3093 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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