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SUMMARY:Alkali technetium oxides and their relation to Tc loading in nucle
 ar waste glasses
DTSTART;VALUE=DATE-TIME:20171102T051500Z
DTEND;VALUE=DATE-TIME:20171102T053000Z
DTSTAMP;VALUE=DATE-TIME:20260814T121659Z
UID:indico-contribution-1136@events01.synchrotron.org.au
DESCRIPTION:Speakers: John McCloy (Washington State University)\nBecause o
 f their radioactive nature\, solid technetium-99 oxides have been rarely s
 tudied\, and there is\na dearth of modern spectra and diffraction patterns
  in the literature. This publication aims to address\nthis by detailing a 
 low-temperature synthesis method for pure\, crystalline alkali pertechneta
 tes\,\nalong with complete analysis by static and magic-angle-spinning nuc
 lear magnetic resonance\, Raman\,\nneutron diffraction (ND)\, and X-ray ab
 sorption spectroscopy (XAS). Insight gained from these\nstudies brings a d
 eeper understanding of the periodic chemistry of alkali (Na\,K\,Rb\,Cs) pe
 rtechnetates.\nAdditionally\, we report attempts to make 5- and 6-coordina
 te pertechnetate compounds of K\, Na\,\nand Li\, i.e. TcO5 - and TcO6 -. I
 t was found that higher coordinated species are very sensitive to\nwater\,
  and easily decompose into their respective pertechnetates. It was difficu
 lt to obtain pure\ncompounds\, but mixtures of the pertechnetate and other
  phases were frequently found\, as evidenced\nby XAS\, ND\, and Raman spec
 troscopy. Additionally\, we summarize other work on Tc loading\nin glasses
 \, effect on glass structure\, and salt formation in overloaded samples. F
 or glasses\, XAS\nchemometrics based on principal component analysis and l
 inear combination fitting suggests that Tc\nis speciated first as isolated
  Tc4+\, as Tc content is increased\, there is more Tc7+ which partitions\n
 first to K neighbors then to isolated sites. Preliminary work is reported 
 assessing HTcO4 and related\ncompounds and their relationships to mechanis
 ms of Tc volatility\n\nhttps://events01.synchrotron.org.au/event/51/contri
 butions/1136/
LOCATION:
URL:https://events01.synchrotron.org.au/event/51/contributions/1136/
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