PHASE COMPOSITIONS AND LEACH RESISTANCE OF ACTINIDE-BEARING MURATAITE CERAMICS

MRS Online Proceedings Library volume 893, Article number: 8930523 (2005) Cite this article

Abstract

Phase composition of the murataite-based ceramics containing 10 wt.% ThO2, UO2, NpO2 or PuO2 and leaching of actinides using a MCC-1 procedure were studied. The ceramics were prepared by melting of oxide mixtures in Pt ampoules in air at ∼1500 °C. They are composed of predominant murataite-type phases and contain traces of extra phases (rutile, crichtonite, perovskite). At least two murataite-related phases with five- and eight-fold elementary fluorite unit cell (5C and 8C) were simultaneously observed. Minor phase 3C (murataite) in the ceramics doped with ThO2 and UO2 was also found. In the Th-bearing sample the 5C phase prevails over the 8C phase. In the U-bearing ceramic they co-exist in comparable amounts. The sample produced at 1500 °C contains crichtonite whereas the ceramic produced at lower temperature (1400 °C) contained rutile. Higher temperature favors further rutile reactions with formation of crichtonite. The Np- and Pu-doped ceramics are also composed of major the 5C and the 8C phases and minor rutile and crichtonite (in Pu-loaded sample only). Unlike the sample prepared under slightly re-ducing conditions (in glassy carbon crucible) the Pu-doped ceramic produced under neutral conditions (in Pt ampoule) doesn’t contain perovskite-type phase. Occurrence of perovskite in the first sample was sup-posed to be due to reduction of some Pu(IV) to Pu(III) during experiment. Leach rates (7-day MCC-1 test, 90 °C) of the actinide elements from all the ceramics studied are at the level of 10-6-10-7 g/(m2·day).

This is a preview of subscription content, access via your institution.

Access options

Buy single article

Instant access to the full article PDF.

US$ 39.95

Tax calculation will be finalised during checkout.

References

  1. 1.

    F.J. Ryerson, J. Amer. Ceram. Soc. 67 (1984) 75–82.

    CAS  Article  Google Scholar 

  2. 2.

    S.V. Stefanovsky, S.V. Yudintsev, B.S. Nikonov, B.I. Omelianenko, A.G. Ptashkin, Mat. Res. Soc. Symp. Proc. 556 (1999) 121–128.

    CAS  Article  Google Scholar 

  3. 3.

    S.V. Yudintsev, S.V. Stefanovsky, B.S. Nikonov, B.I. Omelianenko, Mat. Res. Soc. Symp. Proc. 663 (2001) 357–365.

    Article  Google Scholar 

  4. 4.

    A.M. Portnov, L.S. Dubakina, G.K. Krivokoneva, Rep. AS USSR (Russ.) 261 (1981) 741–744.

    CAS  Google Scholar 

  5. 5.

    T.S. Ercit, F.C. Hawthorne, Canad. Miner. 33 (1995) 1223–1227.

    CAS  Google Scholar 

  6. 6.

    V.S. Urusov, N.I. Organova, O.V. Karimova, S.V. Yudintsev, S.V. Stefanovsky, Russ. Acad. Sci. Rep. (Russ.: ДокладьІ PAH) 401 (2005) 226–232.

    Google Scholar 

  7. 7.

    Nuclear Waste Materials Handbook (Test Methods). Report DOE/TIC-11400 (1981).

  8. 8.

    I.A. Sobolev, S.V. Stefanovsky, B.F. Myasoedov, Y.M. Kuliako, S.V. Yudintsev, in: Plutonium Futures – The Science. Conf. Trans. K.K.S. Pillay and K.C. Kim (eds.), Santa Fe, July 10–13, 2000. (AIP Conf. Proc N532, 2000), pp. 122–124.

    Google Scholar 

  9. 9.

    Y. Zhang, K.P. Hart, B.D. Begg, E.A. Keegan, A.R. Day, A. Brownscombe, M.W.A. Stewart, Mat. Res. Soc. Symp. Proc. 713 (2002) 389–395.

    CAS  Article  Google Scholar 

  10. 10.

    S.V. Stefanovsky, O.I. Kirjanova, S.V. Yudintsev, B.S. Nikonov, B.I. Omelianenko, Phys. Chem. Mater. Treat. (Russ.) [3] (2001) 72–80.

    Google Scholar 

Download references

Author information

Affiliations

  1. SIA Radon, 7th Rostovskii lane 2/14, 119121, Moscow, Russia

    S. V. Stefanovsky, O. I. Stefanovsky & A. G. Ptashkin

  2. Institute of Geology of Ore Deposits RAS, Staromonetnii lane 35, 119017, Moscow, Russia

    S. V. Yudintsev, B. S. Nikonov & A. V. Mokhov

  3. Vernadsky Institute of Geochemistry and Analytical Chemistry RAS, Kosygin st. 19, Moscow, Russia

    S. A. Perevalov

Authors
  1. S. V. Stefanovsky
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. S. V. Yudintsev
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. B. S. Nikonov
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. A. V. Mokhov
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. S. A. Perevalov
    View author publications

    You can also search for this author in PubMed Google Scholar

  6. O. I. Stefanovsky
    View author publications

    You can also search for this author in PubMed Google Scholar

  7. A. G. Ptashkin
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to S. V. Stefanovsky.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Stefanovsky, S.V., Yudintsev, S.V., Nikonov, B.S. et al. PHASE COMPOSITIONS AND LEACH RESISTANCE OF ACTINIDE-BEARING MURATAITE CERAMICS. MRS Online Proceedings Library 893, 8930523 (2005). https://doi.org/10.1557/PROC-0893-JJ05-23

Download citation