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SUMMARY:Effects of Li\, Ca\, Fe\, and B on NaAlSiO4 nepheline crystallizat
 ion in high level waste glasses
DTSTART:20171031T010000Z
DTEND:20171031T011500Z
DTSTAMP:20260911T163900Z
UID:indico-contribution-1201@events.synchrotron.org.au
DESCRIPTION:Speakers: Yaquoot Shaharyar (Rutgers University)\, Mostafa Ahm
 adzadeh (Washington State University)\, Jose Marcial (Washington State Uni
 versity)\, Ashutosh Goel (Rutgers University)\, Ambar Deshkar (Rutgers Uni
 versity)\, John McCloy (Washington State University)\n\nOwing to high conc
 entrations of Al2O3 from dissolved fuel cladding and Na2O from basificatio
 n of the waste\, about half of the high-level waste by volume at Hanford\,
  Washington\, USA is rich in both Na and Al.  Formulations of high waste-l
 oading glasses result in lower amounts of SiO2\, which often leads to unde
 sirable precipitation of nepheline (NaAlSiO4).  Nepheline crystallization 
 can be affected by modifiers (Li\, Ca) added to lower viscosity and improv
 e electrical conductivity of the melt.  Also\, B is frequently added to re
 duce viscosity\, and Fe is present in varying amounts from steel tank corr
 osion.  Given the existence of various natural minerals of the stoichiomet
 ries (Na\,Li\,Ca0.5)(Al\,Fe\,B)SiO4\, we sought to study the effects of su
 bstitution in the stoichiometric nepheline glass on the resulting crystall
 ization.  We summarize here several years of work\, including characteriza
 tion by nuclear magnetic resonance\, vibrating sample magnetometry\, Raman
  spectroscopy\, thermal analysis\, x-ray diffraction\, electron microscopy
 \, and electron microprobe.\n\nhttps://events.synchrotron.org.au/event/51/
 contributions/1201/
RELATED-TO:indico-event-51@events.synchrotron.org.au
URL:https://events.synchrotron.org.au/event/51/contributions/1201/
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