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

Published online by Cambridge University Press:  10 February 2011

Trevor Plaisted ,
Pavel Hrma ,
John Vienna  and
Antonin Jiricka
Trevor Plaisted
Affiliation:
Pacific Northwest National Laboratory, Box 999, Richland, WA 99352
Pavel Hrma
Affiliation:
Pacific Northwest National Laboratory, Box 999, Richland, WA 99352
John Vienna
Affiliation:
Pacific Northwest National Laboratory, Box 999, Richland, WA 99352
Antonin Jiricka
Affiliation:
Pacific Northwest National Laboratory, Box 999, Richland, WA 99352
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Abstract

Liquidus temperature (TL) 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 published TL data for HLW glasses with these primary phases, we have computed partial specific TLS 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 608: Symposium QQ – Scientific Basis for Nuclear Waste Management XXIII , 1999 , 709
Copyright
Copyright © Materials Research Society 2000

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References

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