Microscopic characterization of crystalline phases in waste forms

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Transmission electron microscopy (TEM) has been used to determine the microstructure of crystalline phases present in zirconium- and titanium-bearing glass crystalline composite (GCC) waste forms. The GCC materials were found to contain spinels (maghemite), zirconolites, perovskites (CaTiO{sub 3}) and plagiociase feldspar (anorthite) mineral phases. The structure of the uranium and cerium-bearing monoclinic zirconolite was characterized by medium resolution TEM imaging and electron and X-ray diffraction (XRD). The phase was found to contain high levels of iron in comparison to Synroc-type zirconolites. Excess zirconium in zirconolite has resulted in martensitic baddeleyite (ZrO{sub 2}) formation. Anorthite (CaAl{sub 2}Si{sub 2}O{sub 8}) was present ... continued below

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9 p.

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Buck, E.C.; Dietz, N.L.; Wronkiewicz, D.J.; Bates, J.K. & Millar, A. July 1, 1995.

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Transmission electron microscopy (TEM) has been used to determine the microstructure of crystalline phases present in zirconium- and titanium-bearing glass crystalline composite (GCC) waste forms. The GCC materials were found to contain spinels (maghemite), zirconolites, perovskites (CaTiO{sub 3}) and plagiociase feldspar (anorthite) mineral phases. The structure of the uranium and cerium-bearing monoclinic zirconolite was characterized by medium resolution TEM imaging and electron and X-ray diffraction (XRD). The phase was found to contain high levels of iron in comparison to Synroc-type zirconolites. Excess zirconium in zirconolite has resulted in martensitic baddeleyite (ZrO{sub 2}) formation. Anorthite (CaAl{sub 2}Si{sub 2}O{sub 8}) was present as elongated crystallites within a calcium-rich aluminosilicate glass. Lead and iron-bearing anorthite lying along distinct precipitates were occasionally observed within the an crystallographic planes.

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9 p.

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INIS; OSTI as DE95013890

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  • 97. annual meeting of the American Ceramic Society, Cincinnati, OH (United States), 30 Apr - 1 May 1995

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  • Other: DE95013890
  • Report No.: ANL/CMT/CP--84717
  • Report No.: CONF-950401--10
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 83866
  • Archival Resource Key: ark:/67531/metadc785214

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  • July 1, 1995

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  • Dec. 3, 2015, 9:30 a.m.

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  • Dec. 11, 2015, 5:07 p.m.

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Buck, E.C.; Dietz, N.L.; Wronkiewicz, D.J.; Bates, J.K. & Millar, A. Microscopic characterization of crystalline phases in waste forms, article, July 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc785214/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.