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γ-Zirconium Phosphate as a Cs-Waste Form for Partitioned Wastes

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Abstract

γ-zirconium phosphate (γ-ZrP), γ-Zr(HPO4)2 2H2O is an extremely selective cesium ion sieve for nuclear waste solutions. Because of its layer structure, the adsorbed Cs can be directly fixed in γ-ZrP by collapsing the layers upon heat treatment. Fixation of 96 and 98% of the adsorbed Cs was achieved by simple heat treatment at 350°C and 600°C respectively. Thus, heat treatment of this γ-ZrP leads to a good radiophase with good leach resistance. Cs sorbed γ-ZrP can also be converted to CsZr2(PO4)3 [sodium zirconium phosphate (NZP) radiophase] by sintering with ammonium monobasic phosphate and zirconyl nitrate at about 850°C. Thus, γ-ZrP serves as a precursor to CsZr2(PO4)3 radiophase which has comparable leach resistance to other phases under consideration for radio-Cs immobilization.

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Authors and Affiliations

  1. Materials Research Laboratory, The Pennsylvania State University, University Park, PA, 16802, USA

    Sridhar Komarneni & Rustum Roy

Authors
  1. Sridhar Komarneni
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  2. Rustum Roy
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Komarneni, S., Roy, R. γ-Zirconium Phosphate as a Cs-Waste Form for Partitioned Wastes. MRS Online Proceedings Library 15, 77–82 (1982). https://doi.org/10.1557/PROC-15-77

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