Lanthanide-aluminoborosilicate (LABS) glass is one option for immobilizing rare earth (RE) oxide fission
products generated during reprocessing of pyroprocessed fuel. This glass system can accommodate a
high loading of RE oxides and has excellent chemical durability. The present study describes efforts to
model equilibrium crystallinity as a function of glass composition and temperature as well as liquidus
temperature (TL) as a function of glass composition. The experimental method for determining TL was
ASTM C1720-11. Typically, three crystalline phases were formed in each glass: Ce-borosilicate (Ce3BSi2O10),
mullite (Al10Si2O19), and corundum (Al2O3). Cerianite (CeO2) was a common minor crystalline
phase and Nd-silicate (Nd2Si2O7) occurred in some of the glasses. In the composition region studied, TL
decreased as SiO2 and B2O3 fractions increased and strongly increased with increasing fractions of RE
oxides; Al2O3 had a moderate effect on the TL but, as expected, it strongly affected the precipitation of Alcontaining
crystals.
Revised: July 25, 2017 |
Published: June 9, 2016
Citation
Mohd Fadzil S., P.R. Hrma, M.J. Schweiger, and B.J. Riley. 2016.Component effects on crystallization of RE-containing aluminoborosilicate glass.Journal of Nuclear Materials 478.PNNL-SA-121537.doi:10.1016/j.jnucmat.2016.06.018