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.
Revised: August 19, 2008 |
Published: December 9, 1999
Citation
Plaisted T.J., P.R. Hrma, J.D. Vienna, and A. Jiricka. 1999.Liquidus Temperature and Primary Crystallization Phases in High-Zirconia High-Level Waste Borosilicate Glasses. In Scientific Basis for Nuclear Waste Management XXIII. (Materials Research Society Symposium Proceedings Vol.608), 23, 709-714. Warrendale, Pennsylvania:Materials Research Society.PNNL-SA-32486.