In-situ observation of the alpha/beta cristobalite transition using high voltage electron microscopy

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A high temperature water vapor phase is expected to persist in the vicinity of high level radioactive waste packages for several hundreds of years. The authors have begun an investigation of the structural and chemical effects of water on cristobalite because of its abundance in the near field environment. A high voltage transmission electron microscope (HVEM) investigation of bulk synthesized {alpha}-cristobalite to be used in single phase dissolution and precipitation kinetics experiments revealed the presence {beta}-cristobalite, quartz and amorphous silica, in addition to {alpha}-cristobalite. Consequently, this apparent metastable persistence of {beta}-cristobalite and amorphous silica during the synthesis of {alpha}-cristobalite was ... continued below

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11 p.

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Meike, A. & Glassley, W. October 1, 1989.

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Description

A high temperature water vapor phase is expected to persist in the vicinity of high level radioactive waste packages for several hundreds of years. The authors have begun an investigation of the structural and chemical effects of water on cristobalite because of its abundance in the near field environment. A high voltage transmission electron microscope (HVEM) investigation of bulk synthesized {alpha}-cristobalite to be used in single phase dissolution and precipitation kinetics experiments revealed the presence {beta}-cristobalite, quartz and amorphous silica, in addition to {alpha}-cristobalite. Consequently, this apparent metastable persistence of {beta}-cristobalite and amorphous silica during the synthesis of {alpha}-cristobalite was investigated using a heating stage and an environmental cell installed in the HVEM that allowed the introduction of either dry CO{sub 2} or a CO{sub 2} + H{sub 2}O vapor. Preliminary electron diffraction evidence suggests that the presence of water vapor affected the {alpha}-{beta} transition temperature. Water vapor may also be responsible for the development of an amorphous silica phase at the transition that may persist over an interval of several tens of degrees. The amorphous phase was not documented during the dry heating experiments. 20 refs., 7 figs., 5 tabs.

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11 p.

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INIS; OSTI as DE91007613

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  • Materials Research Society fall meeting, Boston, MA (United States), 27 Nov - 2 Dec 1989

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  • Other: DE91007613
  • Report No.: UCRL--101323
  • Report No.: CONF-891119--145
  • Grant Number: W-7405-ENG-48;AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 138022
  • Archival Resource Key: ark:/67531/metadc623908

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 1, 1989

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 16, 2016, 8:02 p.m.

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Meike, A. & Glassley, W. In-situ observation of the alpha/beta cristobalite transition using high voltage electron microscopy, article, October 1, 1989; California. (digital.library.unt.edu/ark:/67531/metadc623908/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.