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New Crystalline Silicotitanate (CST) Waste Forms: Hydrothermal Synthesis and Characterization of CS-SI-TI-O Phases

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Abstract

The radioactivity of the Hanford site waste tanks is primarily from 137Cs and 90Sr, of which can both be selectively removed from solution using a crystalline silicotitanate (CST) ion exchanger. We are currently seeking waste forms alternative to borosilicate glass for Cs-CSTs. In order to obtain a fundamental basis for the development of an alternative waste form, we are investigating synthesis and characterization of CST component phases, namely Cs-Si-Ti-O phases. Two novel Cs-Ti-Si-O phases (one porous, one condensed) have been hydrothermally synthesized, characterized and evaluated as waste form candidates based on chemical and thermal stability, leachability, and ion exchange capabilities.

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Authors and Affiliations

  1. Sandia National Labs, Org. 1845, M.S. 0710., Albuquerque, N.M., 87185-0710, USA

    M. Nyman & T. M. Nenoff

  2. Pacific Northwest Labs, P.O. Box 999, MSIN K8-93, Battelle Blvd., Richland, WA, 99352, USA

    Y. Su & M. L. Balmer

  3. U.C. Davis, Dept. of Chem. Eng. and Mat. Sci. U.C. Davis, Davis, CA, 95616, USA

    A. Navrotsky & H. Xu

Authors
  1. M. Nyman
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  2. T. M. Nenoff
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  3. Y. Su
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  4. M. L. Balmer
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  5. A. Navrotsky
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  6. H. Xu
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Nyman, M., Nenoff, T.M., Su, Y. et al. New Crystalline Silicotitanate (CST) Waste Forms: Hydrothermal Synthesis and Characterization of CS-SI-TI-O Phases. MRS Online Proceedings Library 556, 71 (1998). https://doi.org/10.1557/PROC-556-71

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  • DOI: https://doi.org/10.1557/PROC-556-71

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