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A Single Phase ([Nzp]) Ceramic Radioactive Waste Form

Published online by Cambridge University Press:  21 February 2011

Rustum Roy ,
L.J. Yang ,
J. Alamo  and
E.R. Vance
Rustum Roy
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
L.J. Yang
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
J. Alamo
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
E.R. Vance
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
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Abstract

It has been shown that between 10 and 20% of a simulated PW–4b radwaste composition can be incorporated into a single nhase with the NZP (= ‘MaZr2 P3 o12’) structure. By changing the P/Na and Zr/Na molar ratios (i.e., adjusting the crystal chemical model of where each ion is located in the structure) it has been possible to outline a very ‘forgiving’ compositional regime both at the 10% and the 20% waste loading level within which one obtains one ([NZP]) or two ([NZP] and [monazite]) phases. We have also succeeded in substituting Tio2 for Zro2 in making a TiO2-rich [NTP] waste form analogous to the [NZ]] materials.

Thus we have succeeded in creating monophasic and diphasic ceramic waste forms which can be sintered below 1000° C. Only preliminary leach data have been obtained at 25° and 300°C, and they place this material with good ceramic forms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 15: Symposium D – Scientific Basis for Nuclear Waste Management VI , 1982 , 15
Copyright
Copyright © Materials Research Society 1983

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References

REFERENCES

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