Annual progress report to Battelle Pacific Northwest National Laboratories on prediction of phase separation of simulated nuclear waste glasses

Technical Report · Thu Feb 01 04:00:00 EST 1996

DOI:https://doi.org/10.2172/212482· OSTI ID:212482

Sung, Y M; Tomozawa, M

The objective of this research is to predict the immiscibility boundaries of multi-component borosilicate glasses, on which many nuclear waste glass compositions are based. The method used is similar to the prediction method of immiscibility boundaries of multi-component silicate glass systems successfully made earlier and is based upon the superposition of immiscibility boundaries of simple systems using an appropriate parameter. This method is possible because many immiscibility boundaries have similar shapes and can be scaled by a parameter. In the alkali and alkaline earth binary silicate systems, for example, the critical temperature and compositions were scaled using the Debye-Hueckel theory. In the present study on borosilicate systems, first, immiscibility boundaries of various binary alkali and alkaline borate glass systems (e.g. BaO-B{sub 2}O{sub 3}) were examined and their critical temperatures were evaluated in terms of Debye-Hueckel theory. The mixing effects of two alkali and alkaline-earth borate systems on the critical temperature were also explored. Next immiscibility boundaries of ternary borosilicate glasses (e.g. Na{sub 2}O-SiO{sub 2}-B{sub 2}O{sub 3}, K{sub 2}O-SiO{sub 2}-B{sub 2}O{sub 3}, Rb{sub 2}O-SiO{sub 2}-B{sub 2}O{sub 3}, and Cs{sub 2}O-SiO{sub 2}-B{sub 2}O{sub 3}) were examined. Their mixing effects are currently under investigation.

• Research Organization: Pacific Northwest National Lab., Richland, WA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 212482
• Report Number(s): PNNL--10989; PVTD--C95-02-01GG; ON: DE96008726
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
36 MATERIALS SCIENCE
BARIUM OXIDES
BORON OXIDES
BOROSILICATE GLASS
CESIUM OXIDES
COMPATIBILITY
EXPERIMENTAL DATA
PHASE STUDIES
POTASSIUM OXIDES
PROGRESS REPORT
RADIOACTIVE WASTE DISPOSAL
RADIOACTIVE WASTE STORAGE
RUBIDIUM OXIDES
SILICON OXIDES
SODIUM OXIDES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
WASTE FORMS