The long-term corrosion behavior of titanate ceramics for Pu disposition : rate-controlling processes.

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The corrosion behavior of a titanate ceramic was investigated with the aim of describing the rate-controlling process or processes. These titanate ceramics are similar to SYNROC and are proposed as immobilization materials for surplus Pu. The corrosion behavior was described with results from MCC-I and PCT-B static dissolution tests. Three important observations were made: (a) Ca is released at a constant rate [6x10{sup -5}g/(m{sup 2} day)] in PCT-B tests for up to two years, (b) all of the test leachates are oversaturated with respect to rutile and anatase, and (c) the release rates for Pu and Gd increase with time ... continued below

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8 p.

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Bakel, A. J.; Mertz, C. J.; Hash, M. C. & Chamberlain, D. C. December 2, 1999.

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Description

The corrosion behavior of a titanate ceramic was investigated with the aim of describing the rate-controlling process or processes. These titanate ceramics are similar to SYNROC and are proposed as immobilization materials for surplus Pu. The corrosion behavior was described with results from MCC-I and PCT-B static dissolution tests. Three important observations were made: (a) Ca is released at a constant rate [6x10{sup -5}g/(m{sup 2} day)] in PCT-B tests for up to two years, (b) all of the test leachates are oversaturated with respect to rutile and anatase, and (c) the release rates for Pu and Gd increase with time (up to two years) in PCT-B tests. The first observation suggests that the ceramics continue to corrode at a low rate for at least 2 years in PCT-B tests. The second observation shows that the rate of the corrosion reaction is not affected by the concentration of Ti in solution, suggesting that the approach to saturation with respect to either rutile or anatase is not a rate-limiting process. The third observation shows that the rate of Pu and Gd release increases with time in these tests. While this observation cannot be fully explained at this point, two possible explanations, alteration phase formation and grain boundary corrosion, are forwarded.

Physical Description

8 p.

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INIS; OSTI as DE00750475

Medium: P; Size: 8 pages

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  • MRS '99 Fall Meeting, Boston, MA (US), 11/29/1999--12/03/1999

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  • Report No.: ANL/CMT/CP-99412
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 750475
  • Archival Resource Key: ark:/67531/metadc709107

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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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  • December 2, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 11, 2017, 5:59 p.m.

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Bakel, A. J.; Mertz, C. J.; Hash, M. C. & Chamberlain, D. C. The long-term corrosion behavior of titanate ceramics for Pu disposition : rate-controlling processes., article, December 2, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc709107/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.