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Liquidus Temperature and Primary Crystallization Phases in High-Zirconia High-Level Waste Borosilicate Glasses

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Abstract

Liquidus temperature (T L) studies of high-Zr high-level waste (HLW) borosilicate glasses have identified three primary phases: baddelyite (ZrO2), zircon (ZrSiO4), and alkali-zirconium silicates, such as parakeldyshite (Na2ZrSi2O7). Using publishedT L data for HLW glasses with these primary phases, we have computed partial specificT LS for major glass components. On the Na2O-SiO2-ZrO2 submixture, we have determined approximate positions of the boundaries between the baddelyite, zircon, and parakeldyshite primary phase fields. The maximum that can dissolve at 1150’C in a borosilicate HLW glass subjected to common processability and acceptability constraints appears to be 16.5 mass% ZrO2.

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Authors and Affiliations

  1. Pacific Northwest National Laboratory, Box 999, Richland, WA, 99352, USA

    Trevor Plaisted, Pavel Hrma, John Vienna & Antonin Jiricka

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  1. Trevor Plaisted
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  2. Pavel Hrma
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  3. John Vienna
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  4. Antonin Jiricka
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Plaisted, T., Hrma, P., Vienna, J. et al. Liquidus Temperature and Primary Crystallization Phases in High-Zirconia High-Level Waste Borosilicate Glasses. MRS Online Proceedings Library 608, 709 (1999). https://doi.org/10.1557/PROC-608-709

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  • DOI: https://doi.org/10.1557/PROC-608-709

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